foing

cool, awesome

That show was pretty foing.

FO

short for Friendship Over.

If you don't call me back, consider us FO.

fo

Usually said by niggers, it is a short version of the word for, usually makes them feel they have a bigger chunk.

Nigga 1: "Yo hommie, check up that ass"
Nigga 2: "I'd fo sure bang that"

Fo

personal information

i need to get some "Fo" so that I can make some money

fo sho fo sho

Stating that you are "for sure" going to do something. It is definate and without a doubt (that is why it is stated twice in a row).
Known from the character Seth in the popular teen movie Superbad, where he tells Jules that he will "for sure" buy alcohol for her party.

"Yeah we're going to the party fo sho fo sho. We're going to the party fo sho."

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."