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1.
Said by one, in recognition of a contradictory, absurd or nonsensical statement made by another.

Example-

"I've abandoned free market principles to save the free market system." George W. Bush, (Washington, D.C., Dec. 16, 2008)

Commentator – “... and he’ll have a black coffee, with milk!”

Originated in a Sainsbury's coffee shop in Weston-Super-Mare, circa 2010, whilst observing a stupid, bald Brummie’s beverage order.
black coffee with milk
by Quelmo Rodriguez June 28, 2010