an abnormally large feces left behind in the toilet and is either a)unflushed or b)will not flush. The person responsible for leaving said gromer behind is called a Gromeo.
Dude who left that gromer in the toilet? I don't know who it was but he was a damn Gromeo. That thing had a whole ear of corn in it for sure.

or

Man I gotta get to home base soon, I feel like I got a gromer on deck
by rotceR June 22, 2011

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