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
Get the mug
Get a Jack Flash mug for your buddy Paul.