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Dutch word flapkut comes from Dutch kut
kut (Dutch)
(Brabant, invective) showing deliberately annoying behavior to someone or to mock someone or to disadvantage someone. (vulgar, slang, Netherlands) crap, not entertaining (chiefly Brabantian, derogatory) a strongly disliked person; cunt, bastard. (vulgar, slang) vulva, especially the vagina; cunt, pussy (vulgar, slang, Netherlands) fuck!.
flapkut (Dutch)