Definitions by itsMOOPY

Grandma Thunder 

1/3 Red Bull. 1/3 Grapefruit juice. 1/3 Dark rum.

Serve in highball glass with large ice cube.

"Why do they call it grandma thunder?"

"I have no idea. It tastes really good though."

Grandma Thunder by itsMOOPY April 5, 2010