Definition & Meaning of "cheat day"in English

What does "cheat day" mean in fitness and diet slang?

It is used to describe a day when someone temporarily abandons their dietary restrictions to eat freely, often enjoying foods typically avoided like sweets, fried items, or carbs. People typically schedule a cheat day once a week or month to stay motivated and satisfy cravings without guilt. The term originated in bodybuilding and fitness communities during the 1980s and 1990s, later spreading into mainstream diet culture, social media, and casual conversation.