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

fo

Typographical error of "go," it has now achieved near-meme status for certain internet users.

It originated on www.ar15.com on June 2, 2008. Popular and regular member "shaunofthedead" purported to have the opportunity of an orgy with some unknown people. After drunkenly deliberating for several hours whether or not he should take advantage of this opportunity, at 10:42:57 EST he posted simply "fuck it im foing."

He was never heard from again.

"fuck it im foing"

"Is anyone going to fo to the tea party?"

"Green means "fo."

by PhuzzyGnu September 20, 2009

fo

fo is 4oz of prometh\codiene mix with some sprite and ajolly rancher and yall be leanin thas purple drank baby

i just poured up myself a fo bout to get folded

by springnigga August 29, 2007

fo

reffering to the number "four".
reffering to the word "for".

"Im fo dollas short on my bill dawg"
"Fo sho my niggas"
"Im all fo you baby"
"One, Two, Three, Fo"
"Fo real"

by ShOvel July 24, 2003

fo

Bad english.

by Anonymous April 16, 2003

Fo

Fuck off

you know what, you can just fo

by poopipot May 22, 2016

fo fo fo

N. Two four day work or school weeks separated by a four day weekend.

These next two weeks at school wont be that bad, it's a fo fo fo.

by MV2011 September 4, 2010