FOS

Fishy Odour Syndrome - when someone's genitals smell of fish.

"OMG, that girl I took home last night had a severe case of FOS. I had to fake vomiting and get out of there fast."

by happynoj March 17, 2010

Fo

slang used for cigarette.

Yo let me get a fo.

by Catfuckers should die November 30, 2009

FOS

Friend Over Shoulder
the person (friend or acquaintance) who is always just around when you are having a conversation

"Shh...he might hear you!"
"Are you kidding?! The FOS doesn't know what the fuck is going on in this world"

by smoke weed every day January 4, 2009

[foing]

The gangster term for going.

I'm foing to go buy me some new galoshes.

by Robber snake January 15, 2009

FOS

Father over shoulder.

Stop the cybering! FOS!

by AriBigFatBlackGuy November 30, 2009

Fo

A distinctive characteristic found in few people which gives them this sense of friendlyness an ability 2 do things that others would apear stupid in doing, in a cool way...

1st person:Nigga i cant wear dat..but u can can...
2nd peson: Why??
1st person: Cuz ur Fo
2nd person: Oh ye..

by Ur nigga September 13, 2005

mo fo fo sho

Mother fucker for sure

"Dude I pwnx ur momz11!"
Mo fo fo sho!

by urmotherlicksmyballz November 15, 2009