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 01, 2010
Top Definition
Full Of Shit: no data, no proof, a baseless opinion.
He's F.O.S. He doesn't know what he's talking about.
by gmerritt November 07, 2005
fo'
meaning for
fo' shizzle (for sure)
by keshan January 27, 2003
People who possess abnormally long toes resembling fingers.

These people are often shunned from gatherings that call for the exposure of their abnormal appendages such as swim meets, pedicure sessions and exclusive feet club.
"Oh my god, did you see that girl Emily with the foes? Ew "
by Rekily August 18, 2013
F.O
A short version of "Fuck off"

If you're lazy and don't feel like saying the full sentence, a simple "F.O." will suffice.
hey Jason.... "F.O."
by Chippity Chops November 13, 2004
fo'
(1) meaning "for"

(2) meaning "fool" in some dialects (see stupid ass)
(1)What was that fo'?

(2)Fo' if i catch you in my part of town i will cap your ass.
by Ty Chapman May 04, 2005
FO
fuck off
JP: FO!
Me: Did you just tell him to FO?
JP: No I said "oh"
Me: I totally heard "FO" as in "fuck off", sorta like "FU" for "fuck you"
JP: Hahaha
Me: Yeah I couldn't believe you said that at work
Me: This belongs on Urban Dictionary
by randomness323423 January 29, 2011
'fo
Short for "before"
Shut the fuck up 'fo I beat yo ass!
by Sir_Tweaks January 15, 2015

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