An exclamation to show something has gone wrong.
Jim - "Hey Alan, here is the hyperlink to this cool site about gaming"
Alan - "Gac! You sent me to pregnant people clothing!! >.<"
by FAHKLAH August 29, 2011
Top Definition
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
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 StevieH884422 February 06, 2010
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
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
Acronym for Green Apple Child. Can also be used on National Gac Day, which is the day where we celebrate the Green Apple Child. You can honor it by wearing a Green Apple Child on your stomach.
-Why are you wearing that green thing on your stomach??
-It's Green Apple Child Day!!! Happy Gac Day!
by GAC!!!!! April 14, 2011
Acronym for "Get a clue"
user1: omg they landed on teh moon!1
user2: gac
by mememe January 20, 2005

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