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Defined as:
1) The female equivilant of a wasteman, meaning a loser i.e. waste of space.
2) A slut. A female that can be used (shagged) and then promptly discarded. A woman of easy virtue, though not necessarily a prositute.

This phrase comes from the combination of the words wasteman and gash, and is becoming ever more popular in the north london and the home counties of UK.
1)"Allow that wastegash"
2)"I linked with a standard wastegash last night. Bare casual ting. You know how we do. "
wastegash by MC Blitzkrieg January 30, 2006

wastegate wanker 

The V-8 crowd. Usually inhabiting corners of autoparts stores, feed stores, hardware stores, ect, constantly talking shit on "import" style cars. Commonly refering to 4 cyl cars as slow. Oblivious to the fact that 4 bangers can have double the HP, tq, and gasmileage of any stock to moderatly modified mustang camaro, TA, ect with Mild modification. having twice the HP per cylender, power to weight ration. coining the title, for being known as stupid ignorant wankers.
"all i need is a turbo, you need 4 more cylenders."
wastegate wanker by Adam May 13, 2005

Wastegate Flutter

when your at full boost with your turbo charged vehicle and you let off and your turbo makes a orgasmic sound
my god listen to that dirty wastegate flutterBRAAAAAP stututu”

wastegashdem 

derived from the word gashdem (girl) and waste (to chat shit). therefore its a girl that chats shit and that no1 likes. they are usually wannab gangsters and wear trackies with lots of makeup and try to act hard.
Wastegash: Yes braaaaaap i'm reppin the endz and north weezy for life. hold tite all the mandems and gyaldems.
Aggy: Wow what a wastegashdem
Ahmad(the klest motherfucker alive): Ye Bitch
wastegashdem by ahmad23232 April 19, 2007

Wastealatory Gas 

It is a unofficial scientific term for fart, cut the cheese, break wind, etc...
Man 1: *farts*
Man 2: Dude did you fart?
Man 1: No I released some Wastealatory Gas.
Man 2: So you farted...
Man 1: Yeah.
Wastealatory Gas by Modnoc518 November 13, 2010

wastegate wanker 

Someone with a piss-fart 4 cylinder turbo charged car that drives around the roads at night time revving the tits off them, hoping somebody will notice them. Often involves driving 'round and 'round the same block or circuit numerous times hoping for someone to think they are cool.

This is usually due to lack of penis size and engine cubic inches.
There goes another wastegate wanker.
wastegate wanker by GravelRash November 17, 2003