A blunt/joint of weed laced with cocaine. There is no limit to the amount of cocaine you can use to create a Dirty Thirty, however it is usually a half of a gram or about Thirty dollars worth.
I need some yay to go along with this green so I can roll up a dirty thirty.
by Scrapiron October 6, 2005
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A new word in 2008 for being rich and or outgoing/popular without any effort
Jheeeze dat guys gone dirty thirty!

Im not a hater, buh shes a dirty thirty bitch

lool dirty thirty bwoii
by Anonymizzle14 August 23, 2008
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The holday described as "The St. Paddy's Day of Smoking" Mostly tobacco, dirty thirty happens when the 30th day of the month falls on a saturday or friday.
Dude, What you gonna do for dirty thirty? im gonna smoke my fucking balls off bro!
by Anita Wang March 26, 2007
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The age at which single women without children realise that their biological clock is ticking, As a consequence they may lower their standards and increase their willingness to perform sexual acts as a matter of desperation in order to find a mate/sexual partner. They may also attempt to hook up with younger males as an attempt to elongate their youth.

The expression almost always refers to women, as men are thought to always be in this state.
"Lets go to club x and pull some dirty thirties..."
by MacTheKinife February 24, 2010
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Refers to the thirty seconds of free adult entertainment often offered at hotels.
Greg, Erik, Matt, and Daemon were dissapointed that The Dirty Thirty in their hotel room didn't involve any action. They later realized it was because the couple wasn't knocking boots they were making love.
by Game Scoop super friend October 26, 2009
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A thirty pack of beer! Ususally Keystone!
Hey man we drank a dirty thirty! Right On.
by C-MART September 28, 2005
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