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an expression of heightened disbelief at an incident or occurrence, similar to fuck me running, but implying even more depth of utter disbelief at that which is becoming known to you at the given moment. Denotes the purest amazement that the truly unthinkable has really just occurred.
John says, "Hey! Did you hear Hillary won the election?" and Fred says, "Well... Fuck me running backwards!"
by Hunter Farley May 13, 2008