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Group Adding Cunt - One of those ballbags that you see on Facebook that joins literally every single group that's possible, even if it doesn't link to them in anyway; they still join the groups. Each day a G.A.C. will fill up your homepage with groups that relate to nothing.
1. This is probably what a G.A.C. says to them self on a regular basis, "I'm a wanker, let's join every group."

2. That G.A.C. on my homepage is joining all the groups today...again.
by BallBagBaggins February 06, 2010
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GAC: acronym for 'guilty as charged', used on several occasions in 'Cougar Town' series one, episode seven
Jeez just been in the can and there's an eight-ounce floater-who did'nt flush?
A hand went up....'GAC' said the shy girl
by chilli ring November 06, 2009
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3
Gac can be expressed toward someone or something that's lame, stupid, ugly, etc.
"Bro, gac those highwater pants you got on!"
by kynglyl June 09, 2015
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4
abbreviation of the tv show Ghost Adventures refering to the team, Zak Bagans Nick Groff and Aaron Goodwin, as Ghost Adventures Crew.
Yea! I can't wait to see GAC!
by Parker Teresa Azazel Cassie October 20, 2010
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5
user1: omg they landed on teh moon!1
user2: gac
by mememe January 20, 2005
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Synonymous with modern day derogatory, foul or vulgar language, signifying someone's distaste for something. Can be used to humiliate, agitate, irritate and maliciously depropriate anything, person or place. Can be used as an Adverb or Adjective to emphasize feeling and frustration towards virtually anything.
What the GAC is wrong with you???
GAC you, you GACing GAC!
You are a GACing Idiot!
What the GAC did Bongwater say?
Get the GAC outta my face, you GACass!
by kc5hwb August 02, 2006
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acronym used by the military meaning ground assault convoy

(noun) a series of military vehicles lined up to go somewhere for a mission especially overseas.
"hey private you're riding in the gac to baghdad"
by caffeine22 September 19, 2005
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