Top Definition
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."
#grama thunda #alcoholic drinks #grapefruit #red bull #rum #alcololic drankz
av itsMOOPY 5. april 2010
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