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.
Bro code used for calling your friend a dick or asshole; more formal
Johnathan was such a peen when he touch my mom on the ass. He had sex with her to!
A penis or dick but mostly use when gaming and you live streaming you game and that platform you live stream on doesn’t allow penis or sick on the streams so the streamers say peen
My peen is small
This girl Lydia tryied to touch my peen