"Groova" is the way that the Outward Bound instructor Mick pronounces groover. Basically a box that you shit into (eg, toilet. Smells really bad once everyone's shit accumulates. Usually surrounded by flie or other bugs.

MICK IS THE MAN!
"But but but is ANYONE on tha groova?"
"Who blew tha FUCKING whistle? Is anyone, I repeat is anyone on tha groova?"
by Home slice December 28, 2007
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