This is when the handicap for a sports event, such as a football match, is listed with a half handicap, to eliminate the chance of a draw. For example, Spurs will be given +1.5. Whatever the actual result of the game, the 1.5 added to Spurs goals total will mean that the bet can either win or lose.
In sports betting, a handicap of 1.5 means that one team is given a 1.5 goal advantage before the game starts. This means that if you bet on the team with a handicap of 1.5, they would need to win the game or draw for your bet to be successful.