Top Definition
A vehicle that has been modified so that it produces a loud, rumbling, aggressive noise when the engine is revved. This modification is known as installing a ‘Grunt Valve’
Dave: Bruv, what was that car that just sped past us, sounded like a TVR or something..?

Joe: Nah mate, saxo.

Dave: Shit man, must have a fat grunt valve innit.

Dave: What you sayin Joe?

Joe Just chillin in the grunt valve innit.

Dave: Fair play, whats the grunt valve sayin?


Dave: That’s some serious grunt valve right there Joe, he is on it.

Joe: Innit doe.
by Badmaninnitdoe October 04, 2010

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.