A word used in central Scotland (Perth and Kinross, Fife, Stirlingshire) to describe an unsociable and annoying person. Synonymous with 'dick' or 'twat'.
Person A - "You know that John guy?"
Person B - "Aw yeah he's an actual gak, he needs hit."
by Your Maw's Maw December 23, 2012
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A magical word, which means different things at different times to different people
Nai: Stfu Gakslag
Bri: Make me you worthless piece of Gak
Nai: I love you Gakface
Bri: I love you too Gakfeatures
by your_pixie_the_nai August 14, 2006
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A word that sounds like it should be an ethnic slur, but isn't
Herb: You're such a dirty gak
Walt: What does that even mean?
Herb: I don't know, the tele told me to say it
Walt: I say, shut your pie hole you dingleberry
Herb: That's uncalled for
Walt: I'm sorry, let's get some tea
Herb: Jolly good, you filthy gak...
by U.N. Owen March 2, 2005
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VERB Take without permission, usually from someone else's blog or live journal.
John liked the new quiz on Maria's blog so much he decided to gak it.
by jes December 3, 2003
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A person that hates complainers.
I was bitching, then that Gaks told me to shut up.
by The One You Love to Hate July 10, 2009
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the action when you make a face of disgust when the drips from snorting cocaine starts to go down your throat. if you dont clench your throat, and you let it down, you get the nastiest feeling in the world
person 1- snort!!!!!!!
(about 2 minutes later)
person 1- ewww gak! yuck!
person 2- yup, gotta love those drips
by danman12791 December 15, 2007
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Australian slang term used to refer to street Amphetamine Sulphate, aka 'Speed'.

Once a popular street drug in Australia during the 80's, it's use began to decline during the 90's when powdered Methamphetamine began to surface, which was often sold to users as 'Speed' which it is not.

It's use and availability as a street drug is now uncommon, and has virtually been replaced by the more potent and more harmful drug Crystal Meth, which is known in Australia as 'Gear' or 'Ice'.

Amphetamine Sulphate (Gak) never had the high abuse and addiction rate or caused as many problems as Methamphatamine (Ice) in Australia, when it was around. I have personally heard this from police officers, drug councillors and former users who were around during the 80's.

Gak is also commonly known in Australia as 'Whipper, Whip, Speed, Whizz' or 'GOey
"Back in the day, you could get a bag of Gak, go out on the weekend, have a great time and it was all cool. Didn't fuck as many people up and turn them into tweakers like Meth does now days"

"GAK?! Fuck yea us rack up a line!!"
by GottaGoFast72 September 28, 2017
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