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To shout in absolute disbelief, while wearing faded tight blue 80's jeans, a white singlet with a look of shock on your face.
e.g ...jump... back...
In the great 80's hit Footloose Kevin Bacon says;
Jump back! This guy doesn’t know a dance from a dipstick!”

by tersh August 30, 2006
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slang for "No Way!" or "Woah!"
Guy 1: Dude, Dan asked Katie out!

Guy 2: Jump back! I was gonna ask her out!
by Gina March 22, 2005
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