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F.O stands for Family Only which started in Kansas City Missouri it’s not a gang it’s a family
Bill-u heard about F.O?
Tony- them niggas ain’t no joke
F.O by Realassy April 21, 2018
Related Words
short for the First Order the first order is the military embodiment of the dark side in the star wars sequel generation the leader of the the first order was mostly supreme leader Snoke then his apprentice kylo ren killed him and now he is the new supreme leader.
F.O by starwarsqwertyu May 15, 2018
F/O usually stands for Fictional Other, which is a term often used by Self-shippers, mainly on Tumblr.

You can have romantic, familial and platonic F/Os!
Self Shipper 1#: Yo, I got a new F/O!!
Self-Shipper 2#: That's so cool, who are they?
Self Shipper 1#: It's Peter Parker from The Amazing Spider-Man, 2012!
F/O by enotits October 14, 2018
f/o by Mr fuck off November 11, 2013
F.O is an abbreviation/slang to Friendship Over.
Person A: *starts to be racist*
Person B: F.O. !!!!
F.O. by Hope Margaret May 24, 2019
F.O. is an exsteem odor produced by the female.

A pungent odor emitted by a female receving a vist from T.O.M.
F.O. by Meg M May 13, 2005