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!!!!
member of the cushty air kids, known for speed and power
there goes jack flash