Top Definition
A thick red liquid resembling cough syruyp found in a large bottle behind the bar in Edinburgh, Scotland at a night club called Opium. Said liquid is marked only with lined paper tapped to the bottle reading ROCKBEAST. It costs a pound a shot and its vile...and personally I think it takes your will to live.
"What do you think Rockbeast is?"

"I don't know. Barman, I'll have 3...no wait 5...nope 7."
by Leah mother fuckin Bell May 22, 2008

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