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1.
Synonym for Thirty Pack. Refers to a package of 30 beers, usually cheap beer.
Hey man, you bringin' a Dirty Snack tonight? We're jonesing for some suds.

by Wigsten October 24, 2006
 
2.
30-pack of beer.
Hey, since we've got band practice tonight, would you mind stoppin' on the way in and pickin' up a dirty snack?
by cinnamonjack November 09, 2009
 
3.
The name given to any kind of unhealthy food. Burgers, Chocolate, cake, crisps, chips. (the good stuff!)
Feeling a bit hungary, Dave went to the vending machine for a dirty snack.
by BOBtheDAZZLER March 02, 2009