An acronym, most likely stands for "Fuck Off." This comes from the movie "Smokey and the Bandit." A 1977 film that's popularity was surpassed only by "Star Wars" that year.

A way of pronouncing the number "four" or the word "for" in ebonics.
Bandit: Do the letters FO mean anything to you?

Porch Monkey1: I just threw some twenty fos on my candy painted lo.
Porch Monkey2: What kinda whip yall ass be ridin' dirty in?
Porch Monkey1: You know it gotta be a six fo!
Full Of Shit: no data, no proof, a baseless opinion.
He's F.O.S. He doesn't know what he's talking about.
by gmerritt November 07, 2005
meaning for
fo' shizzle (for sure)
by keshan January 27, 2003
(1) meaning "for"

(2) meaning "fool" in some dialects (see stupid ass)
(1)What was that fo'?

(2)Fo' if i catch you in my part of town i will cap your ass.
by Ty Chapman May 04, 2005
People who possess abnormally long toes resembling fingers.

These people are often shunned from gatherings that call for the exposure of their abnormal appendages such as swim meets, pedicure sessions and exclusive feet club.
"Oh my god, did you see that girl Emily with the foes? Ew "
by Rekily August 18, 2013
A short version of "Fuck off"

If you're lazy and don't feel like saying the full sentence, a simple "F.O." will suffice.
hey Jason.... "F.O."
by Chippity Chops November 13, 2004
fuck off
JP: FO!
Me: Did you just tell him to FO?
JP: No I said "oh"
Me: I totally heard "FO" as in "fuck off", sorta like "FU" for "fuck you"
JP: Hahaha
Me: Yeah I couldn't believe you said that at work
Me: This belongs on Urban Dictionary
by randomness323423 January 29, 2011
Airline First Officer (Co-Pilot).Works in concert with the Captain in performing the duties required to operate an airplane safely on the ground and in the air. Typically a younger (less senior), less experienced pilot, but nonetheless a competent professional. Flies the airplane from the right whereas the Captain sits in the left seat.
The FO flew the leg from LAX to JFK.
by apilot April 18, 2007

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