verb

• (transitive) To turn one's back on, to show one's (clothed) backside to, as a sign of disrespect.
  "And when they succeeded in forcing themselves back upon the King, who loathed them, and had rumped them, they put the Great Seal into Commission, and omitted Lord Brougham's name in the list of the Cabinet."
• (somewhat vulgar, slang) To fuck. (Compare bum (verb).)
  "Rodrigo had also set eyes on a woman at court but I doubt he was rumping her in the hay, like I was with Maria. In Rodrigo's case, it was more a sort of teenager fascination of the unobtainable."
• (UK, slang) To cheat.
  "Seems this Stevie had a score to settle with some guy that had rumped him over a bundle of traveller's cheques and he thought by telling me this guy was the one that shot me I'd find him and kill him stone dead; […]"

name

• (British, historical, with the) The Rump Parliament of 1648-1653 and 1659-1660.
  "Before executing Charles I, the Rump made it illegal to proclaim anyone else king to replace him."