Term refering to any drink produced by the Rosenberger's Dairies Company. "Rosies" especially refers to the Iced Tea and is traditionally carried by teenagers in the half gallon bottle and sometimes worn on the hip by the use of a beaner.
Note: Rosenberger's Dairies plant is in Hatfeild PA and is shipped mainly in the tri-county area (Philladelphia, Montgomery, and Bucks)
For just $1.27 you get buy a bit of heaven; that heaven is called "Rosies"