Top Definition
A real S.O.B., a step up from motherfucker (but perhaps less offensive when heard in public). Evolved from motherfucker and inspired by the monstrocity Mothra, a foe of the famous Godzilla.
"That mothrafucker just stepped on my sac!"
"Mothrafucking Godzilla is always going around stepping on people's sacs."
"Only a real mothrafucking mothrafucker would commit such an inconsiderate act."
by TEO the Invisible Sandwich April 03, 2006

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