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A slang term originated in St.louis in the early 90's. Meaning a person not just your friend derrty can also be your enemy.
Hey yo!!! Derrty betta quit trippin before derrty get his ass beat.

Hey yo!!! What up derrty, what's good wit u?
derrty by Lil Mike February 29, 2004
Related Words
Whats the deal derrty...or there go my main derrty Kiley
derrty by Malcolm Redfield August 21, 2003
Meanin ur mo, ur friend, ur boy/gurl.
Da playa u grew up wid.
Yo derrty, was goin on?
Wherre da rest of da mo'z @ derrty?
Derrty by Katey Vince (Hype MC) November 28, 2003
a word Nelly likes to use, meaning friend/buddy/pal.
sup derrty, wassup in tha hood?
derrty by teh definitioner August 14, 2003
Dirrty james sullivan came up with it trying to be cool. it means the same thing as dirrty, a.k.a slutty
Derrty by alexa September 30, 2004

Derrty Derrty 

Nickname for STL or St. Louis, MO; also known as the Lou or St. Louie
Allie: Are you going to the casino in the derrty derrty this weekend?

Greg: Oh hell yeah I'll be there!!
Derrty Derrty by AlBert October 4, 2013