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15.
Name for someone with some type of STD. Usualy it can be assumed with sluts and whores.
Guy A...so man what you do last night

Guy B...man i ended up fuckin that ashly chick.
Guy A...dude i hope you used a condom, that chick is dirty.
by jimster1989 February 15, 2009
 
1.
not clean
i was in the mud, i am now dirty.
by yeah May 11, 2003
 
2.
a little slut
Looks go out and scoop up some dirties tonight.
by Herb N. Dictionary November 04, 2002
 
3.
really good. a superlative, sick, awesome
Micah is real good at basketball.
Yeah, he's dirty.
by CT April 06, 2003
 
4.
Way of ordering/preparing a martini; made by adding a splash of olive juice to a martini (atop the usual dry vermouth and vodka/gin), garnished with an olive.
"Grey Goose martini, dirty, please."
by E.L. Train June 26, 2006
 
5.
Those nasty, ghetto, slutty chicks that block up the halls in your highschool. When you try to pass them you feel like you need a shower to sanitize yourself of the drugs and herpes that you were just possibly contaminated with. Usually characterized with big, baggy sweatshirts or hoodies and jeans with slits passed 5 inches up the side of the leg.
I was trying to tell you a story in the hall but those dirties were in the way!
by Wonder Twin #2 October 30, 2005
 
6.
(1) To be in possession of an illegal substance, particularly drugs.
(2) To be using drugs or found to be using through a test
(3) Shifty, greasy, unkempt, possession bad manners; having “redneck” qualities.
(4) A mullet
(1) I'm not going to the concert with you if you are dirty. We might get busted.
(2) Barry Bonds never showed up dirty on his tests because he took measures to ensure he showed clean.
(3) She's so dirty; he must be mad about her to wanna go out with someone s-o-o-o-o on the other side of the tracks.
(4) Dawg the Bounty Hunter has a helluva dirty.
by Bill Peters October 12, 2006
 
7.
Any group of girls that aptly fit the term dirty.

Usually see in murderous packs at parties.
"Oh shit, check out that group of dirties that just lamped in!"
by the product September 13, 2005