When a a dude and chick have anal sex and when the guy pulls out, poop is on his dick and he slaps the girl on the cheek with his dick removing all of the poop on his dick and leaving it on her face in the shape of a mushroom.

The stamp usualy worn by hookers after a rough night.

Getting hit with the shaft of a male leaving an impression on ones forehead.

This is when a guy hits a girl in the forehead with the tip of his penis.

Specifically, the bottom part of a circumcised penis looks like a mushroom head, so the male would tap the bottom tip of his dick on her forehead with his mushroom and thus stamping her forehead.

Typically performed on females that you feel are sluts to make them feel like a complete slut.

the mark left when one hits their partner in the face with their dick after thuroughly buttsexing them and having a poop covered dipstick, leaving a mushroom shaped mark on their head from the remaining fecal matter.

the act of pushing the tip of your own cock into your anus - just slightly - thereby inking your tip - and then imprinting the mushroom image onto said victim

To slap a persons forehead with a penis