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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Time of day, specifically 12:30pm. Considered to be dirty due to the possibility of people who work 9-5 to use their work breaks for brief snippets of mischief.
James: When are you taking a break?
Bob: Dirty Thirty. Going to go grab a beer and then come back.
by GothamsCapedCrusader February 18, 2016
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When you and a friend split a 30-rack of any beer, and split a white castle crave case 30-pack.
Don't do it the next morning I threw up pink balls?!?!?!
by cam_fash March 8, 2005
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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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