wiktionary
ref
Calque of a Mande term, perhaps Vai[Term?] [1] or Mandinka[Term?], [2] which entered English via Gullah[Term?]. [3] Compare Japanese 悪口(わるぐち)(waruguchi, “badmouthing”), which is a compound of 悪(わる)(waru, “bad, wicked”) and 口(くち)(kuchi, “mouth”).
