Monkeys-might-fly-out-of-my-butt definitions

(idiomatic, vulgar) Usually used as a response (often with hint of sarcasm) to a situation that you think there is no chance of ever occurring.

‘I am sure he'll pay you back tomorrow.’ ‘Yeah right, and monkeys might fly out of my butt.’

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Origin of monkeys-might-fly-out-of-my-butt

Popularized by the 1992 film Wayne's World. Likely a variation on pigs might fly.