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A generic, covertly sarcastic response to a really stupid comment.
"My '88 Caddy is the hottest thing on the road, dude!"

"The hell you say."
by Patrick W. Crabtree January 09, 2008
Bullshit; I don't believe it!
Holy Man: "And if thy tongue offend thee, cut it off:"
Literal Dumbo: "The hell you say!"
Holy Man: "Past the end of your nose and over your head..." (facepalm)
by preciousbritches July 05, 2013