A delicious mixture of grape soda (usually Grapette) and rum (usually Captain Morgan). Invented by an Aeronautical and Astronautical Engineering student at the West Lafayette, Indiana campus of Purdue University. Rum can be substituted with vodka or other alcohol depending on what is available. Typically tastes like Grape Otter Pops or Robatussin, depending on the person.
Dillon: Hey Sam, what the hell is this drink called? It's DELICIOUS!
Sam: It's called Grape Drank. I invented it yesterday.
Dillon: What's in it?
Sam: Grape soda and Captain Morgan.
Dillon: Damn, this is good.