n. to describe a person who is 'Full Of Shit', and treats those who try to help them with disrespect.
Person 1: 'I'm not coming to my doctor's appointment today because you didn't tell me I had to pay anything.'
Person 2: 'Don't be such a FOS.'
by Maria Espia March 17, 2008
Abbrev. Full of shit.
by Targen December 02, 2002
An abbreviation, meaning "fuckable-on-site". Used to classify extremely sexy people who arouse others to an immediate, uncontrollable frenzy.
Jared Leto (of 30stm) - inherently FOS. No question.
by _Jules_ December 17, 2008
The acronym for a person who is Full of Shit. When someone is constantly telling outrageous lies, typically about themself, in order to impress others.
"Did you hear that FOS was offered a full scholarship to Harvard, but turned it down to be a UPS driver?"
by Quinn Littles May 14, 2009
Abreviation for "Full of Shit"
You are so "F.O.S."
They are really so "F.O.S."
by Bev Lane May 29, 2006
Full of shit
Never trust a used-car salesman, they're all FOS.
by Barbarella11 December 20, 2010
Code word for full of shit to get you out of trouble. You say it to someone and they just look confused when other people might realize what it means. Can also be pronounced Fos for short.
When my teacher told me that my homework assignment I turned in was worth a D when I knew it was worth and A, I said "You're F.O.S., this work is flawless!" I got sent to the office because apparently he knew what F.O.S. meant.
by PrincessR December 06, 2009
Acronym for Fuck On Sight. A type of individual when seen by another, one would be willing to have sex with without knowing anything about them, not even their name.
"Dude, that girl in the parking lot, her eyes, those hips, she's a definite F.O.S."
by mayej May 10, 2009

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