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2. dirty 30s
Marijuana that is over priced, often sold as chronic (30 a half eighth 60 an eighth) when it is actually mid grade weed (20 a half eighth 60 an eighth)
Jimmy: Did you get that chron yet?

Zack: Ya, but it turned out to be some of them dirty 30s.

Jimmy: Aint that a bitch.
1. dirty 30s
The 30-aves in East Oakland, California. Hella dangerous for non-residents.
Where that hoe Bubbles stay at?
She stay in the dirty 30s.
Shit, I ain't tryin' to hit that bad.