Top Definition
not unlike a mushroom stamp, a stampon is the sexual act where the male removes his penis from the females menstrating vagina and strikes the female in the face or forehead, leaving a red stamp in the shape of the penis.

called a stampon due to the penis acting as a temporary tampon and also being used as a stamping utensil.
My girlfriend told me she was menstrating while we were having sex. Angered, I pulled myself out and gave her a stampon to show my disapproval.
#bloody mushroom stamp #period blood #sex #sexual #penis
by Nedd January 31, 2007
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