dickhead

noun3

1. •
   (slang, vulgar) The glans penis.

   • ...down, down, sinking down faster than she's so far moved, the dick head exploding up into all that wet, warm slime... — 1970
2. •
   (vulgar, offensive) A jerk; a mean or rude person.

   • I don't want them Special Forces guys left out there when some dickhead is afraid to go get them. — 1965
3. •
   (vulgar, offensive) A stupid or useless person.

   • "Watch it, dickhead!" "Hey, Stan, that's my shirt you just dropped in the snow!" — 1979