A person who is being really annoying.
Just call someone "Captain Butthole" the same way you would call them "Turd Pants" or "Butt Licker" or "Ass Wipe".
1.Captain of the famous ship "The S.S. Buttflap"
2.Someone ka-awesome.
"Who's that dude standing on the top of that statue?"
"Oh that's Captain Ka-Buttholes... He's searching for land"