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Being a derivative of the phrase "mother fucker" (and it's other derivative, "mother fuck"), an expression used to describe disbelief and awe; synonymous with such phrases as "holy shit" and "what the fuck."
Chuck: Sorry dude, but I wrecked your car last weekend.

Dante: Mothery fuck, you're such an idiot.
by PhillCantu93 January 26, 2010
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