Bro-head is when two normally heterosexual male friends perform oral sex on one another. Usually, it is fraternity types who fail to see the homosexual implications of this act.
Bro-head (a variation on Road head)
"We were just hanging out last night, playing X-box, having a few beers, listening to Coldplay, one thing led to another and BAM!! Bro-head.
Bro 1. Yo, I'm really stressed out and my girlfriend is out of town, I need some bro head.
Bro 2. Oh, let me take care of that. You know I always got your back.