To place a mushroom stamp mark on the belly of a pregger. This usually occurs after invasive belly touching, with or without consent of the forementioned pregger.
Jess: Hey!!!, Jeremy just invasively touched my pregnant belly! I hope he doens't plan on belly stamping me! I only trust my other male companions for proper belly stamping.
by Taint toucher October 29, 2013
buy the domain for your pet vlog