Burn off Definition 1 of 4Pro Tip 1/3Workout Intensity Phrase implies vigorous exercise to eliminate unwanted elements like fat. She did an hour of cardio to burn off last night's dessert. Pro Tip 2/3Physical Activities 'Burn off' is not limited to formal exercise routines; any vigorous activity applies. Playing soccer with friends can burn off a lot of calories. Pro Tip 3/3Health Context Often used in discussions about diet, fitness, and weight loss. The dietitian recommended more exercises that would help burn off extra calories.