The neighborhoods of 30th - 39th Avenue located in East Oakland CA. Home to perhaps the largest Latino community in Oakland as it's streets are commonly filled with Mexican Reastaraunts, Taquerias, Taco Trucks, Panaderias, and Mexican Supermercados.
What it do? You wanna hit up the dirty thirties tonight holmes?
by Blasphemous[Deity] June 28, 2006
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A sexual act performed by one girl, thirty guys and a merry-go-round. To do this, the girl kneels on the edge of the merry-go-round and the merry-go-round is given a swift spin. As the merry-go-round spins, the girl then gives head to each male in the circle, creating a seemingly endless circle of blow jobs.
Jimmy: Hey, did you get the dirty thirty?
Leo: No, I can't drink, there are exams this week.
Jimmy: No, I mean the dirty thirty from Nafer.
by sweetlou69 April 24, 2010
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The age in which it becomes socially unacceptable for a man to ogle and hit on any female under the age of 20. Its just creepy to see a dirty old man (age 30 and over) salivating over a hot young thing (less than 20 years old)!
It didn't bother me so much when Bill was 29 and hitting on the hot little 19 year-olds, but now that he is dirty thirty, it is just sad to watch.
by E.J.K. January 26, 2008
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Noun, South Side Chicago: 1. A $30.00 eighth of cheap weed, invariably containing many seeds and stems; 2. Nick Swisher, player for the Chicago White Sox, who is in possession of both the fire and the passion.
"You pick up some dank tonight?"

"Nah, just a dirty thirty. It's straight, though."

--

"Fuck yeah! Dirty 30 just doubled to left!"

by Red Line Mike May 15, 2008
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When a Penis is 30 percent erect.
Ron: That fat bitch has a peeping thong!
Steve: Yeah but it's kinda hot. I got a dirty thirty
by item535 June 9, 2005
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A bad type of Marijuana, most likely having seed's inside of the buds.
Mostly "brick weed" or weed that is dense and extremely compacted. Most bud smokers like fluffy weed.
-Luke always has dem Dirty Thirties.

-I grabed a snacth offa Jim the other day, and found out that it was Dirty Thirties, and i payed for dro.
by Moley the mole-ester October 15, 2008
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An individual approaching the age of thirty, nonetheless in denunciation of the aging process and notwithstanding, insists on lying about their mounting years simply by acting the part. Sometimes called teenial. The denial of the teen years long gone by.
Big Gay Billy is so ‘dirty thirty’, even shopping at the Gap won’t help his plight. Being thirty is really dirty.
by James March 18, 2004
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