To toke on a joint and 'green-out' or feel sick. reffering to the character Blanka in the popular game 'street fighter', the term is popular among those hardcore gamers who still play two-dimensional fighting games. Many of whom tend to smoke grass.
#2: ok, chief
#1: take this while I level 3 this guy with Chunners (passes the drugs)
#2: (takes a drag, eyelids droop and turns as green as Blanka)
#1: (laughs and pulls off a deft spinning bird kick, as his friend commences Drawing-a-blanka )