its a definition of cat on urban dictionary
Person1: do you know what an epic creature that will shoot fire at you if you get near it is
Person2:WHAT!?!!!???
Person1:it's a cat
Person2:uhh... no, it's not. cats dont shoot fire
Person1:i found that on urban on our discord server
*Person1 shows it to Person2*
Person2:yoooooooooooooo, that's cool
Person1:i know right
Can be used in multiple ways but it’s something you say to someone when they say/do some out of the ordinary stuff or you want them to be quiet.
“ Say something else and ima fire on you. “
“ You gon get fired on “
“ Why would you tell her that, I’m finna fire on you now. “