in a pig's eye

something that you say which means you think there is no chance that something is true or that something will happen Me, in love with Sandra? In a pig's eye I am.

Under no condition, not at all, as in In a pig's eye he'll pay me back, or You think he's competent? In a pig's eye! This expression, a euphemism for in a pig's ass, is generally used as a strong negative. [Slang; late 1800s]

Under no condition; never.

Untrue. “Eye” is a rhyme for “lie.” “Pig” has an unpleasant connotation. Put them together, and you have an expression for something that's patently false. The phrase was most often heard as a rejoinder to a remark that the hearer believes is untrue. To the statement that “The Cubs will win the World Series next year” might well be the response, “In a pig's ear.” Or, to use another porcine phrase, “When pigs fly.”