When a guy hits a girl in the face with his penis. This often happens when a girl is giving a guy head. Usually an absurd gesture that a man will do to a promiscuous woman.
Guy: "So i was getting with Cheryl, and I totally cockbrained her!"
When a horny Male records a boomerang like video of his shaft and head. Then in a homosexual like manner proceeds to send the cockarang to a group of Male friends.
Last night the boys and I bonded like no other with a cockarang we all came together it was beautiful! Like most boomarangs I reckon we will all come back!