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An interjection denoting disbelief. Primarily heard in UK. Clean up the house, my arse! You've been promising to do that for months but haven't so much as lifted a finger around here. A: "John said he makes six figures a year." B: "My arse, he does. He's still living in that shabby flat."
See also: arse
my arse!used to express strong contradiction or disbelief.
2005 Barbelith Underground Forums Opera my arse, it's a musical with a Napoleon complex. Though I still liked it.