When someone doesn't have the same point of view as you, you use this saying. Usually used in a sarcastic tone.
"Oh my God! Don't you just love watching hamsters piss!?!"
"Hmm, Whatever bums your mum."
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As in "Are you having a bubble bath?"
From "Are you having a laugh?" in Cockney.
"I go out with your little sister!"
"Are you having a bubble???"
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