Meanings
How to pronounce "on fire":
AU
Being burned by fire.
Example: "If the wind picks up and the flames spread, the whole town could go on fire."
Overwhelmed with emotion; beside oneself.
Excited, enthusiastic or passionate.
Doing very well; achieving good results at a rapid rate.
Example: "That striker has scored four goals so far – he's on fire!"
Sexually aroused.