Top Definition
The ultimate put down. Someone who has all the redeeming features of a rhinos rear end. Derived from a combination of the phrases arse (meaning backside) and clart (meaning a person).
Bill: "I can't make it to the pub tonight"
Karl: "Oh, you arseclart!"

"Oh no, that arseclart just threw up in a taxi! What a mess!"

Famous arseclarts include George W Bush, David Cameron and Dido.
by Jamie Douglas March 06, 2007
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