Slut: Like so many of these words, slut has its origins in Middle English and was first documented in the 15th century. It was originally spelled slutte and meant a "dirty, untidy or slovenly woman" and was also considered a synonym for "ugly." Given the pejorative nature of its original definition, it wasn't a far leap to slut's modern-day definition, but even through the 19th century the word's original meaning was preserved. Garbage cans were called "slut-holes" (kind of awesome, no?), but by the 20th century the term had been transformed to mean promiscuous woman.