Meaning

originFrom the 1930s, origin unknown. Suggestions include a variant of British slang moke (“donkey”); a variant of US slang mooch (“a sponger, beggar, idler”); Irish muc (“pig”); Dutch mok, German Mocke, Mucke (both dialectal for “sow” and hence “slovenly or bothersome woman/person”); a corruption of Italian mammalucco (“fool”, literally “mamluk”).

Etymology from Wiktionary, CC BY-SA 3.0