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17.
Gak
A word used when you are unable to make yourself say anything else. A bit like a stunned silence, without the dignity of actually staying silent.
Leisha: OMG there's Justin Beiber!
Justin Beiber: Hey sexy lady.
Leisha: GAK !
Justin Beiber: Wow, you're a retarded fan who is too stunned to say anything because of my amazing hair.
Leisha: GAK !
by aaaaFiance July 04, 2010
 
1.
gak
Speed, meth, twick, crank, methamphetamine, Desoxyephedrine.
Ack! we're out of gak.
by Gakster October 22, 2003
 
2.
gak
A popular Nickolodeon slime, available in many variations such as glow in the dark, speckled, cocoanut smelling, etc. Useful for making fart noises, grossing out friends or as sexual lubricant.
Sweetie, we ran out of KY gelly, go get some of your step daughter's Gak.
by Dameon Jackson January 17, 2005
 
3.
gak
Means 'Generelle Abkürzung' (General Abbreviation) in German and can therefore be used for literally EVERYTHING.
-I LOVE you!
-gak?
~~
-gak gak gak?
-gak!
-gaaaaaaak?
-gak gak!! (gak...)
~~
-Hello!
-gak
by Luca November 19, 2003
 
4.
Gak
popular slang word for coke or blow.
Man, let's go line up a couple of phatty gakkers bro.
by SlipStream May 17, 2003
 
5.
Gak
The Bronie's kryptonite.
"GAKGAKGAK"
by BronyPony November 30, 2012
 
6.
Gak
A old guy who plays a gum leaf to attract children to his white ford falcon to rob them of their childhood!
Backs to the WALL!
Gak's on the PRAWL!
by Penis Pal May 17, 2008
 
7.
1) Usually a form of displeasure, as if someone were to yoink the last chip and leave you with nothing

2) The funny sound people make RIGHT before vomiting.

(1a) "Gak! That's my chip bitch!"

(2a) "Oh man... GAK! (hurk)"
by Zhunter March 14, 2007