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1. thirty
A thirty pack of beers (thirty rack).
A thirty of natty light's only around $15.
by gus Dec 26, 2004 add a video
2. thirty
A slang term for a hardcore porno movie. Derived from the Roman numeral that stands for the rating (XXX).
I was watching a thirty when my dad walked into my room.
by J T Dollar Sign Sep 26, 2003 add a video
3. thirty
A "key word" used by modern males to alert one another of an oncoming attractive female.
Hey Joe, thirty!
by Joe Garrett May 7, 2004 add a video
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