Top Definition
A street term for a special type of medical heroin... if u hav ever had heroin you know why its called that!!!
Zack: Yo man after i broke my arm when i got fucking slammed into the ground the hospital gave me some Jack Flash i am gonna try to get some extra so i can sell it

Miano: YA!!! then we can buy weeeeed!!!!
by Ross The Great April 14, 2007
member of the cushty air kids, known for speed and power
there goes jack flash
by watson and jackson5 June 25, 2006
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