blue mushroom
see also mushroom bruise and mushroom tatoo. It is the mark on a woman(or man), after being whipped by an erect penis.
did you see the mark on her face?, that must've been a blue mushroom
Blue Mushroom
The act of gripping an erect penis by the shaft right below the head and punching the penis until it is completely bruised.
I was with this guy last night and he totally wanted me to blue mushroom him!