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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Thirty pack of "Miller High Life" cans.
Dude, I drank a whole dirty thirty last night -or- Wanna get a dirty thirty?
by sarah515valleyjunctioncrew March 23, 2004

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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 23, 2010

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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 14, 2008

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A case of pure genuine Old Style Light.
Me and the boys tackled a dirty thirty before going to the bars the other night.
by ossil May 30, 2005

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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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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 22, 2008

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