A weakling that is really below average

Derived from the 1980's Alexander Foss
Man you really fossin it tonight
by JoeSkirt October 06, 2012

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n.- somebody who thinks they are a boss

-a fake boss
If someone talks about getting mad biddys when they dont and self proclaiming themselves a boss they are really a foss.
When someone talks about being a boss when they have a girlfriend/boyfriend-a foss
by J Toral June 24, 2009

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Full Of Shit Syndrome
"Hey i think your mate has a case of FOSS"
or

You can just nickname someone who talks alot of shit "FOSS"
by h0m1ez July 22, 2008

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An old or otherwise lame person. Short for fossil.
Man, did you hear what that fossil said to me? Plural usage: Check out the fosses in their Volvos.
by Annie Olson November 02, 2006

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A word used for a gay person that acts extra gay
Dude 1: You coming to Max's party??

Dude 2: Of course

Dude 1: Okay dress up

*Next day*

*Max opens the door sees guy sitting in with legs crossed guy bites his lips and tells max to come over*

Max: OMG ITS A FOSS!

*Max runs in the house*
by >;3_Yur_Wrst_Nightmare_>;D March 02, 2010

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The best online female gamer you will find anywhere in the UK

Agent 47 : FOSS, THAT WAS A NICE SHOT
Foss : ;) you get me
by yumiko July 14, 2007

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Acronym for Full of Shit Southerner. Used to describe a person from the South (including but not limited to the following states: NC, SC, GA, TN, AL, MS, LA, VA and KY) who is politely being evasive, untruthful, disingenuous and/or passive aggressive. A common behavior found in regional southern culture and widely deemed unacceptable to a northerner, who typically values being forthright. For example, the acronym is applicable when someone is 'yessing' you to death and truly means 'no'.
"That person was a FOSS. She kept saying she's love to buy a timeshare from me, and when I asked her for her credit card, she made all sorts of excuses."

"Total FOSS's. They're from North Carolina."
by TSnyc September 06, 2014

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