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A cock with a overly large head shaped much like the cap of a mushroom. The result is a (or what seems to be) a thin shaft with a mushroom cap like dick head.
Hathaway: (pulls down pants)

Dow: Nice cockshroom, now go shove it in a rusty blender

Bill: Couldent have said it better myself
by Fugget McDoogel December 04, 2006
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