An expression of extreme dismay, or shock
Jed: "Your mother-in-law was just killed when she drove off a cliff."
Red: "Um hmmm."

Jed: "She was driving your 2006 custom dually Dodge 4WD Mega Cab Cummins Turbo Diesel."
Red: "Shit oh fuckin dear!"
by CalifCoyote May 28, 2006
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