Slut or slattern is a pejorative term for a person who is deemed sexually promiscuous. The term has traditionally been applied to women and is generally used as an insult or offensive term of disparagement. Slut has also been reclaimed as a slang term in the BDSM, polyamorous and gay and bisexual communities. It may be used by the person concerned as an expression of pride in their status, or to express envy at the "success rate" of others.
Although the ultimate origin of slut is unknown, it first appeared in Middle English in 1402 as slutte (AHD), with the meaning "a dirty, untidy, or slovenly woman." Even earlier, Geoffrey Chaucer used the word sluttish (c.1386) to describe a slovenly man; however, later uses appear almost exclusively associated with women. The modern sense of "a sexually promiscuous woman" dates to at least 1450.