arsehead

From arse +‎ head.

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arsehead (plural arseheads)

1. (UK, Ireland, Commonwealth, vulgar, derogatory, slang) An idiotic or undesirable person.
   • 1987, Blackadder the Third: Dish and Dishonesty:

     Blackadder: Meet the new Member of Parliament for Danny-on-the-Wold.
     Prince George: But he's an absolute arsehead!