1)
head to head; in a
competitive sense, generally reserved for male participants.
2) cockhead to cockhead; in a sexual, possibly
competitive sense, reserved for males and shemales, but could be anyone with access to a cock or dildo.
1) "Hey man, I'm a little nervous, I've gotta go cock to cock with Dave later at the foosball tournament,
wish me luck.."
2) "Hey man, get
your cock over here and we'll go cock to cock like we were talking about earlier.