Skullhump
to ride the top of a bald (or balding) man's head until climax. The lesser-known sister-move to the more violent Skullfuck.
"That guy is so hot."
"Not the bald one."
"God yes the bald one. I just want to skullhump him until I collapse."
"Not the bald one."
"God yes the bald one. I just want to skullhump him until I collapse."