FOS

The acronym for a person who is Full of Shit. When someone is constantly telling outrageous lies, typically about themself, in order to impress others.

"Did you hear that FOS was offered a full scholarship to Harvard, but turned it down to be a UPS driver?"

by Quinn Littles May 14, 2009

fo'

meaning for

fo' shizzle (for sure)

by keshan January 27, 2003

fo'

(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 5, 2005

FOS

An abbreviation, meaning "fuckable-on-site". Used to classify extremely sexy people who arouse others to an immediate, uncontrollable frenzy.

Jared Leto (of 30stm) - inherently FOS. No question.

by _Jules_ December 17, 2008

fo-fo's

fo-fo's are the rims of your car...this originated in the south...when swangin you must have a nice car with nice fo-fo's.

look at dat car ova there tippin on fo-fo's

by ~*Nix*~ June 13, 2006

FO

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 30, 2011

FOS

Abbreviation: FOS = Full of Shit

• It can mean that someone is lying, therefore full of shit.

• It can also mean the literal aspect, the state of being FOS.
(constipated) or (bowel obstruction)

That patient is totally FOS, just trying to get some drugs.

The patient in room 22 is literally FOS; constipated as hell.

They tried to tell me a BS story about losing their prescription, but I can tell they are FOS.

by Night.ER.Ninja July 27, 2014