2) adj./adv. phrase - a slang expression to add emphasis, excitement, or intensity to a sentence. Usually used to describe something hot, flaming, burning etc.
3) noun - a slang expression meaning to rebel. Usually yelled in a battle cry fashion to express the fact to everyone you are going against the man
(Got its third meaning in response to the censorship to have bears on fire)
2."She's as hot as a bear on fire"
2."Alright for my next trick i have a bear...and fire...BAM! It's a bear on fire."
3."Screw it, i'm doing it anyway. BEARS ON FIRE!"