A dick that, like the Grinch's heart, is two sizes too small, specifically in girth. It can also be used to describe an extremely unusual dick.
"He's pretty hot, but he has a total grinch-dick."
"Ooh, that sucks."
by bowtheif November 21, 2016
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Person 1 : Damn dude, look at that big piece of bud.

Person 2 : Hell yeah man that looks like a grinch dick
by Logan "Mr Overtime" September 28, 2016
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Overly ripe bananas. A week or two before being edible
Wow, why did you buy grinch dicks? We can’t eat those
by Khailaty December 4, 2018
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