slut

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Often Offensive A person considered to be sexually promiscuous.
• noun A woman prostitute.
• noun An untidy, dirty woman; a slattern.

from The Century Dictionary.

• noun A careless, lazy woman; a woman who is uncleanly as regards her person or her house; a slattern: often used as a name of contempt for a woman and (formerly) also for a man. See sloven.
• noun A young woman; a jade; a wench: used lightly.
• noun An awkward person, animal, or thing.
• noun A female dog; a bitch.
• To befoul; render unclean.

from the GNU version of the Collaborative International Dictionary of English.

• noun An untidy woman; a slattern.
• noun obsolete A servant girl; a drudge.
• noun A female dog; a bitch.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun countable, often derogatory A sexually promiscuous woman or girl.
• noun countable, derogatory A man with the above qualities, often a gay man.
• noun countable, archaic, derogatory A slovenly, untidy person, usually a woman.
• noun countable, obsolete, derogatory A bold, outspoken woman.
• noun countable, obsolete A female dog.
• noun countable, obsolete A maid.
• noun countable, obsolete A rag soaked in a flammable substance and lit for illumination.
• verb To wear slutty clothing or makeup, or otherwise behave in a slutty manner.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a woman adulterer
• noun a dirty untidy woman