Ethiopian Hedgehog 

this is commonly known as a prison move. The Ethiopian Hedgehog is a defensive maneuver in the case of anal rape, where the possible target of the attack uses a large amount of pomade to spike up their anus hairs and allows to dry. The attacker would then be surprised when attempting to mount the victim when a a hair-spike either pokes the head of their penis or enters the urethra.

Yeah my big buddy was gonna try and cornhole me but I already had my Ethiopian Hedgehog ready.

Ethiopian Hedgehog by Free Muffins December 23, 2014