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This is an Acronym being made famous daily meaning; Fuck Around N(and) Find Out. It can be used as all 4types of Noun, adjective, or a verb even. Basically its kind of like the word Smurf in Smurf language.
This FANFO ass dude always testing someone patience.

Hey brother you better calm yo ass down before yo as FANFO!
by Mr Webby April 04, 2021
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May 1 Word of the Day
When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.
I’m tired I wanna go home

“Oh I didn’t know it was pee pee poo poo hours”
by A7sa July 03, 2019
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