A variation of the word teammates, a Derpmate is the kind of player you encounter 99% of the time on Xbox Live or Playstation Network while playing first-person shooters. Derpmates are generally poorly skilled at the game, fail to follow directions, and generally just make the game un-playable and not fun, by constantly dying and screwing up while you're trying to get them to do the god damn Shangri-la Easter Egg!

A polite term for shoving a lubricated probe into the Earth's hole to release gas.