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On the show Torchwood, the relationship between the characters Gwen Cooper and Captain Jack Harkness is known as Gwack(in the style of 'ship names like Spuffy).

This relationship is terrible. seriously, it's so badly conceived. It just doesn't work. Therefore gwack can be used as to describe anything terrible.

It's also a great onomatopoeia for vomiting. Honestly - Gwaaaaaaaaaaaaack. Which Gwack makes people want to do.
"What a pile of gwack"

"Seriously, I'm going to gwack"

"Gwack make me want to gwack"
gwack by Cuilean March 30, 2008
Related Words

Ghackers Guilt 

The guilt one feels when coming down from a multiple day speed/meth/ghack binge. Sorrow filled hopelessness in a scattered meth mind. When you realize that you are seriously out of control and it's affecting your life and others.
"I feel like I'm going nowhere with my life". I'm so fucking up on the ghack, '! "Come on dude relax, you just got a bad case of ghackers guilt'.

Gwackson 

A Gwackson, more often used as “pulling a Gwackson” or “doing a Gwackson” is when 2 people who are extremely stupid have the audacity to have unprotected sex, using the pullout method, or when 2 people have sex in the woods, or a public place.
“Bro, he’s so hot, next time I see him I might have to pull a Gwackson”

“Did you hear that Gwen and Jackson did a Gwackson???”
Gwackson by Blue face baby yuh July 13, 2019
ghack smoke is shite hashish in northern Europe that tastes of petrol. probably due to the way it enters the country it gets to. As you burn the ghack sometimes in the middle you find bits of plastic rubber sellotape maybe if your lucky you can come across one of the small toy trolls anything is possible in that mash of shite. ghack is the lowest of the lowest grade sold to people with the least money too expensively. it is a Marxian class warfare illuminate conspiracy thing.
"jesus tommy look at the clip a this ghack, theres bits a plastic in it and everything. it tastes like fucking petrol"

"oh no way i heard there was ghack floatin about . we need to do buckets with it instead to get wrecked"
ghack by Cycic Lepraprawn February 12, 2014

Gwack em' 

slang term when playing basketball.
Gwack em' by Pete April 2, 2003
When a boy cheats on his girlfriend by cuming in another girls butthole.
He gwacked in her butthole.
gwack by tracy April 14, 2004