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1908, "female criminal," second element from nickname of Mary, used of disreputable females since early 1600s; first element from slang gonif "thief" (1885), from Yiddish, from Hebrew gannabh "thief."
A female criminal or a criminal's consort
[1908+; fr gonif rather than fr the firearm; Moll is a diminutive of Mary and has been identified with notorious women since the early 1600s]