You know you're hot, so show it with our On Fire emoji. The phrase "on fire" is an idiomatic expression used to describe someone who's....You know you're hot, so show it with our On Fire emoji. The phrase "on fire" is an idiomatic expression used to describe someone who's performing exceptionally well or experiencing a period of great success. It implies a high level of skill, productivity, or achievement in a particular endeavor. Often, broadcasters will use it to describe an athlete on a roll.
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