Mushroomstamp

To slap someone with your penis in the face leaving a mushroom shaped red mark on the victims face.

That girl was so drunk when I gave her a mushroomstamp it knocked her out cold!

by M Sul May 12, 2003

mushroomstamp

to slap somone on the forehead with the tip of a penis

"while marsha was sleeping she was mushroomstamped by joe"

by Anonymous March 11, 2003