Vampire nipple
When you go to pop a pimple on your chest and it starts bleeding like a motherfucker.
Dude 1: "dude, this zit on my chest, I fucking popped it and it's bleeding like a motherfucker!"
Dude 2: "Oh dude, you got a fucking vampire nipple!"
Dude 2: "Oh dude, you got a fucking vampire nipple!"