A bruised imprint from the head of a circumcised penis. Generally applied via a violent whipping of an erect penis against the face of the offending party.

A swimmer

The sign of a slut. Every bitch that has a red mushroom shaped mark on the forehead or cheek is from an erect penis slapping it to signify to the other males the sluttiness of sed bitch. It is the duty of a man who has come in contact with a slut to give her the mushroom tat.