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A French expression that most directly means "no way" or "yeah, my ass!" in the sense that the speaker is responding something that he/she believes is blatantly false or misconceived. In a more literal sense, it translates to "my eye."
Person 1: Connaissez-vous l'Amérique a un président nègre maintenant? (You know America has a black president now?)

Person 2: Mon oeil!
by Baslimagain March 12, 2010