Fo

slang used for cigarette.

Yo let me get a fo.

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."

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"

[foing]

The gangster term for going.

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

FOS

Father over shoulder.

Stop the cybering! FOS!

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..

mo fo fo sho

Mother fucker for sure

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