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(noun)- Is the physical result of the sphincter making an indentation ring around a turd.
I took a dump today and it had 3 grunt rings on it.

Shelia has such a tight ass that I had two grunt rings on my dick when I pulled out of her ass.
by Cyanide Gas October 22, 2010
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Apr 28 Word of the Day
Literally everyone, ever. Including the writer of this definition.
by masokitsune January 17, 2019
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