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Ever wonder what “juice” means, but you don’t want to look clueless in front of your friends? Or what the heck a “prop” is when everyone’s talking bets? We’ve got you covered.
This is the ultimate glossary of sports betting terms — from basics like moneyline and spread to sharper concepts like expected value and line movement. Whether you’re new to betting or just brushing up, here’s everything you need to know to sound (and bet) like a pro.
The language of betting isn’t jargon — it’s the framework that reveals where value lives. Bettors who understand the language see the market differently.
Core Betting Basics
Moneyline
The moneyline is the simplest bet in sports: you’re picking who wins outright.
- A minus number (–150) means the team is favored — you’d need to bet $150 to win $100.
- A plus number (+200) means underdog — a $100 bet would win $200.
👉 Why it matters: Moneylines are straightforward, but the payouts reveal implied probability. –150 means the book thinks the team has about a 60% chance to win. Knowing that math helps you spot value if you disagree with the line.
Point Spread (Spread)
The point spread is the sportsbook’s way of “leveling the field.”
- A favorite at –7 must win by more than 7 for you to win your bet.
- The underdog at +7 can lose by up to 6 (or win outright) and still “cover.”
- Land exactly on 7? That’s a push — your stake comes back.
👉 Why it matters: Betting the spread isn’t about just who wins, it’s about by how much. It creates action even in lopsided matchups. Smart bettors look for “key numbers” like 3 and 7 in football spreads, since so many games land on those margins.
🔎 Want to go deeper? Read "Point spread explained" here.
Over/Under (Total)
Instead of picking a team, you’re betting on the combined score.
- If the line is 48.5, “over” means 49 points or more, “under” means 48 or fewer.
- Books set totals for every game, and sometimes even for halves or quarters.
👉 Why it matters: Totals let you play the pace and style of the game. Rainy weather, elite defenses, or fast-tempo offenses all impact overs and unders.
Parlay
A parlay is a combo bet where multiple picks are linked together. All of them must hit for you to win.
Example: Chiefs moneyline + Lakers –4 + Yankees over 8.5. If even one misses, the whole ticket busts.
👉 Why it matters: Parlays offer juicy payouts because the odds multiply. But the risk multiplies too. Sportsbooks love parlays because most are –EV. Sharper bettors either keep parlays small or avoid them altogether.
Teaser
A teaser is like a parlay, but you get to adjust the line in your favor.
- Example: moving a football spread from –7 to –1 (or +7 to +13).
- The catch: payouts are smaller, and all legs must still hit.
👉 Why it matters: Teasers can be valuable when used around key numbers in football, but casual bettors often over-tease and give away expected value.
Round Robin
A round robin creates multiple smaller parlays from a bigger group of picks.
- Example: Pick 3 teams → round robin makes 3 two-leg parlays and 1 three-leg parlay.
- It’s like hedging your parlay bets.
👉 Why it matters: Round robins lower risk compared to a giant parlay, but vig adds up fast. Use sparingly.
Odds & Payouts
American Odds
The +/– system common in the U.S.
- +150 = bet $100, win $150.
- –120 = bet $120, win $100.
Decimal Odds
Standard internationally. Example: 2.50 = $100 returns $250 (profit $150).
Fractional Odds
Traditional UK format. Example: 5/1 = bet $100, win $500.
👉 Why it matters: All odds express implied probability. Learn to convert between formats and you can compare value across sportsbooks.
🔎 Want to go deeper? Read "How to read sports odds" here.
Juice / Vig
The vig (short for “vigorish”), or juice, is the house edge baked into every bet.
- On a spread, you’ll often see both sides listed at –110.
- That means you have to risk $110 to win $100.
- If the book sets perfect 50/50 odds, they still profit off that extra $10.
👉 Why it matters: Juice is why line shopping matters. Finding –105 instead of –110 saves you money over time. For consistent bettors, shaving the vig makes the difference between winning and losing long-term.
🔎 Want to go deeper? Read "What does vig/juice mean?" here.
Push
A tie. If the spread or total lands exactly on the number, bets are refunded.
👉 Why it matters: Always note whether the line has a “hook” (half-point). Cowboys –7.5 removes the possibility of a push.
Strategy & Bankroll
Unit
Your standard bet size. Keeps bankroll management simple (e.g., $20 = 1 unit).
👉 Why it matters: Units let you compare records fairly, no matter your bankroll size. A creator going +15 units is showing consistent value, not just raw dollars.
🔎 Want to go deeper? Read "What is a unit in sports betting" here.
Bankroll
The total pool of money you set aside for betting.
👉 Why it matters: Smart bettors risk only a small % of bankroll per play (often 1–3%). Keeps you alive through swings.
🔎 Want to go deeper? Read "Bankroll management" here.
Stake
The amount you put down on a single bet.
ROI (Return on Investment)
How profitable your betting is over time (profit divided by total wagered), shown as a %.
- Example: Bet $1,000 total, profit $120 → ROI = 12%.
👉 Why it matters: ROI tells you efficiency, not just volume. High ROI = sharp.
Expected Value (EV)
Expected value is the stat that separates casual bettors from sharps.
- Formula: (Win Probability × Win Amount) – (Loss Probability × Loss Amount)
- Example: $100 bet at +150 odds with a 45% true win probability: EV = (0.45 × 150) – (0.55 × 100) = +$12.50
👉 Why it matters: EV tells you if a bet is profitable in the long run. A bet can lose more often than it wins and still be +EV. Moddy leans on EV as a north star — helping bettors spot real edges and avoid fake hot streaks.
🔎 Want to go deeper? Read "Expected Value explained" here.
Popular Bet Types
Prop Bet (Proposition Bet)
Props are wagers on specific outcomes within a game, not just the final score.
- Player props: Mahomes over 2.5 passing TDs
- Team props: First team to reach 20 points
- Exotic props: Super Bowl coin toss, color of the Gatorade shower
👉 Why it matters: Props are fun, but they can also hide value — especially in player matchups where data points expose edges.
🔎 Want to go deeper? Read about player props and game props here.
Futures
Bets on long-term outcomes, like championships or awards.
👉 Why it matters: Futures tie up your bankroll for months. They’re fun, but sharp bettors only play them if they see real +EV.
Same-Game Parlay (SGP)
A parlay built entirely from bets within one game.
👉 Why it matters: Hugely popular, especially in NFL and NBA. Sportsbooks promote them hard because the vig stacks. Use carefully.
Alt Lines
Alternative spreads or totals offered at different odds (e.g., Chiefs –3 instead of –7).
👉 Why it matters: Alt lines let you tailor risk/reward. They can be powerful if tied to a specific theory.
🔎 Want to go deeper? Read about using alt lines to your advantage here.
Market Lingo
Handle
Total money wagered on an event.
👉 Why it matters: Big handle = big action, often with sharper lines.
Sharp
A professional bettor with an edge. Opposite of a casual or “square.”
🔎 Want to go deeper? Read "How sharps think vs. how the public bets" here.
Square
A casual bettor, often following the public.
👉 Why it matters: Knowing where sharp vs. square money is flowing helps you read line movement.
Public Money
Where the majority of casual bets are landing (often opposite sharps).
Steam Move
A rapid shift in odds caused by heavy sharp money.
👉 Why it matters: Following steam can work, but by the time you see it, value may be gone.
Line Movement
How odds change leading up to (or during) a game, usually reflecting money flow or news.
👉 Why it matters: Lines don’t move randomly. They reflect money, injuries, weather, and sharp action. Learning to “read” line moves is a core betting skill.
🔎 Want to go deeper? Read "Line movement explained" here.
Why This Matters
Sports betting has its own language — and once you speak it, you’re already ahead of many bettors.
Knowing terms like moneyline, spread, vig, and EV isn’t just about sounding smart at the bar — it’s about understanding the bets you’re making and spotting real value.
At Moddy, we believe smarter betting starts with clarity and transparency. This glossary is your first step toward both.
