FOS

this is a shorter term for "Flap Of Skin". a flap of skin is someone in your group of friends whom you may consider the "loser" or the person who you only hang around with for a certain reason, that reason not perticulary meaning you enjoy their company.

it could also mean someone with NO private parts.
" Kris has no vagina"

"She is but a Flap Of Skin!"

"I couldn't concentrate when the FOS was talking to me, she annoys me to much."
by i heart flap of skin July 12, 2009
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fo

Intentional misspelling of "of" for ironic effect.
Might that we could have to leave this general vicinity and retreat southward till the coming fo dawn.
by Troy February 06, 2003
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fo

you gonna bag that hoe? fo.
by Phloop October 12, 2003
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FO

Nathan Fillion created the acronym FO, which is the short form for his phrase Full On. It can be used on its own, and/or to intensify a phrase, such as Double Rainbow.

It means that which is:

•fully ecstatically wondrous

•beyond joyfully amazing

•intensely orgasmically blissful
Here are some usage examples for FO, which is short for Full On. (For more examples, see the Twitter page belonging to NathanFillion:)

Nathan Fillion, on his Twitter page, kindly acknowledged my entry work defining his recommendation of the new "in" phrase: "Double Rainbow" on Urban Dictionary! He said it is "Full on." Thank you, Nathan. You are so Full On Double Rainbow! (FO DR!)

The TV shows Castle and Firefly are so intense, they are Full On Double Rainbow! (FO DR!)

Serenity, the feature film starring Nathan Fillion, is so vivid, it's Full On Double Rainbow! (FO DR!)

Nathan Fillion is so awesomely spectacular, sexyhotmessgorgeous, and brilliantly talented, his fame is sweeping across the nation, and over all the world! He is Nathan "Full On" Fillion!
by Kcat10 August 02, 2010
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FOS

An acronym that stands for: Full of Shit. pronounced "Faas"(long a sound), used do descirbe a statment from someone who is a habitual liar or bullshitter
Johnathan: Yeah i got my hot asian fiancee pregnant...
Everyone else: FOS FOS FOS!!!
by Apoo7 December 11, 2008
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Fo Sho Mo Fo

"For sure, motherfucker" - said as if you were drunk, and your mouth is full of marbles (or balls). Frequently used by old men to appear young.
Kid: Dad, you wanna go get a burger after the game?

Dad: Fo sho mo fo!

Kid (embarassed): Oh, I forgot I have homework.
by moehong August 15, 2010
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foing

That show was pretty foing.
by Dr. Samuel Adams May 03, 2004
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