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1.
Facial expression adopted by scorned women. So called due to the (*) shape created by the lips resembling a cats sphincter.
Dave doesn't come to the pub any more - I heard his wife gives him the 'Cats Arse'if he does.
by Antony Butnut March 18, 2004
 
2.
Otherwise known as 'a good thing'
That episode of "The Office" was the Cat's Arse
by Darren Jonusas January 20, 2005