An act of mushroom stamping, but with a giant penis, usually to a person being a complete douche. This is appropriately done by slapping said douche in the face with said penis. If correct technique is applied, the stompee will have a giant, dick-shaped imprint on his face.
"Justin was being a huge dick, so Luke mushroom stomped him with HIS huge dick."
by YouCanSuckABigOne February 03, 2012