tell that/it to the Marines

(go) tell it/that to the marines

A scornful or incredulous response to a story or statement that one does not believe or finds ridiculous. A: "You know, my dad used to play basketball with the president when they were both kids." B: "Ah, go tell it to the marines! Why do you tell such fibs?" A: "I bet you I could eat 20 hot dogs in less than half an hour!" B: "Tell that to the marines, pal!"
See also: marine, tell, that, to
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

tell that/it to the Marines

Try fooling some more gullible person, because I won’t fall for that story. This term originated about 1800 in Britain, when sailors had nothing but contempt for marines, whom they regarded as gullible greenhorns. Byron used the expression in The Island (1823): “That will do for the Marines but sailors won’t believe it,” remarking that this was already an old saying.
See also: Marine, tell, that, to
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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