slut

1402, "a dirty, slovenly, or untidy woman," probably cognate with dialectal Ger. Schlutt "slovenly woman," dialectal Swed. slata "idle woman, slut," and Du. slodder "slut," but the ultimate origin is doubtful. Chaucer uses sluttish (c.1386) in ref. to the appearance of an untidy man. Also "a kitchen maid, a drudge" (c.1450; hard pieces in a bread loaf from imperfect kneading were called slut's pennies, 18c.). Meaning "woman of loose character, bold hussy" is attested from c.1450; playful use of the word, without implication of loose morals, is attested from 1664.

"Our little girl Susan is a most admirable slut, and pleases us mightily." [Pepys, diary, Feb. 21, 1664]

Sometimes used 19c. as a euphemism for bitch to describe a female dog. There is a group of North Sea Gmc. words in sl- that mean "sloppy," and also "slovenly woman," and that tend to evolve toward "woman of loose morals" (cf. slattern, also Eng. dial. slummock "a dirty, untidy, or slovenly person," 1861; M.Du. slore "a sluttish woman").