Heads or tails? Definition 1 of 2Pro Tip 1/3Decision Making Used for making quick decisions or resolving disputes with an equal chance of either outcome. Who pays for pizza? Let's do heads or tails. Pro Tip 2/350-50 Chances Refers to a fair choice where both sides have an equal probability of being chosen. Heads or tails? Either way, you have a 50% chance to win. Pro Tip 3/3Game Starter Often used at the beginning of sports matches to decide which team starts with the ball. Captains, ready to call heads or tails for the kickoff?