When a guy gets a boner that shows through his pants (the male equivalent of nippin' out).
Cockin' out in church is considered inappropriate in most parts of the country.
by punish me pink June 02, 2010
When a guy is showing the outline of his penis through his pants. Kind of like a girl showing her nipples through her shirt (nippin' out)
"Did you see Matt in class today? He was totally cockin' out"
by I love D&Bs November 19, 2009