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
โดย chilli ring 06 พฤศจิกายน 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.
โดย StevieH884422 06 กุมภาพันธ์ 2010
Gac can be expressed toward someone or something that's lame, stupid, ugly, etc.
"Bro, gac those highwater pants you got on!"
โดย kynglyl 09 มิถุนายน 2015
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!! >.<"
โดย FAHKLAH 29 สิงหาคม 2011
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!
โดย Parker Teresa Azazel Cassie 20 ตุลาคม 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!
โดย GAC!!!!! 14 เมษายน 2011
Acronym for "Get a clue"
user1: omg they landed on teh moon!1
user2: gac
โดย mememe 20 มกราคม 2005


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