Gack

A word used by a fucking idiotic British person who tried to create his own language while playing video games on YouTube.

Gavin of Achievement Hunter used the word 'gack' and was promptly called a fucking idiot.

by Uncle Steve The Crack Addict June 14, 2016

Gack

Something truly unhealthy yet shallowly rewarding.

Get some gack while you are at the shop: NikNaks, Starbars - all the major food groups.

by Old Moore's Balzac December 10, 2022

gack back

Used to describe back pain due to extensive slouching while using crystal meth and/or blow.

"Damn, my gack back is killing me."

by AnonymousTweaker August 23, 2021

gack dancer

Someone so high on meth they move uncontrollably. This usually includes wildly exaggerated leg ,hip, arm and butt movement that often look like their moving to some unknown beat and looks like very much like the dance the Elaine character on Sinefeld does.

I can't be around her when she tweeks , she turns into a gack dancer moving all crazy like that.

by Kris burkholder June 8, 2017

Gack

Gack also spelled gach is a word to be used when something is gross unpleasant weird strange or nasty started being used in Ireland 2015 and has grown to a common word

It is a great word to add to your vocabulary

Gack

Ew that meat is gack

I saw jo pick his nose, ew that's fucking gack

That's one big spider that's so gack

Your such a gacky person

by Degreeinbruh September 1, 2017

gack

a person who can’t handle his alcohol and prefers overweight women

oh no thats his 5th beer, he will probably be a gack and try plug a fatty tonight

by handlemart42 July 24, 2023

gack

A dark substance composed of melting snow, dirt, spilled beer, and a powerful mix of other excretions and spillings that stained SUNY @ Oswego students' shoes/boots after an evening imbibing at such places as Broadwell's and Buckland's (mid 80's through early 90's).

Doug: Yo, Dave, what the fuck is on your boots?

Dave: It's gack from Broadwell's last night.

by MoshKing88 March 10, 2023