The round end of a blacksmith hammer, typically used for "peening over" the sides of a protruding rivet.
Bro, I totally used my peen to round the end of my rivet, after hammering it into the hole with the head of my ball-peen hammer.
PeenKing, Peen has a honey-like smooth voice and a long ass green tongue. Serves do missions for peen and love peen. PeenIs nice to serves nice to him.
ServesLovePeenSoMuch.
Stan BTS you cowards
by: nova.c on insta
Having unprotected sex before you should which results in getting pregnant as a teen, making you a peen.
Omg, did you see that girl over there? She just joined the club of the peens.
Peen is something boys and girls suck.
"Hey Jim, did she suck your Peen last night?"
"Hell yeah she did."