Coca-Cola Icee beverage regularly found at theaters and quickie marts. Blow is a common slang term for cocaine, which increased in popularity and awareness after the Johnny Depp/Penelope Cruz movie of the same name, Blow. Cocaine was an original ingredient in Coca- Cola, thus the name, Frozen Blow.
Concession Employee: "Sir, what kind of tasty beverage would like during the showing of your movie tonight?"
You: "I will have a large Frozen Blow, please."