Very finely chopped up marijuana and tobacco. Preferably chopped up with decently sized kitchen cutlery on a cutting board, or just any hard surface for that matter (whichever you prefer) and mixed together as if you were creating your own "chop-salad." Once the product is finished being chopped, take the concoction and precisely pack as much as physically possible into a bong, pipe, or bubbler (bong is your best bet), and enjoy.
Also, it's customary when smoking chop in the presence of "virgin choppers," that nobody speaks of the effects of chop chop, but rather just let the victim rip the shit out of the bong and let him marinate in his own sudden intoxication.
**DISCLAIMER: Some may become uncontrollably addicted to chop-chop, however, we are not to be found responsible for any addictions that do occur after reading this excerpt**
Man 1: So, whatcha wanna do for the next hour?
Man 2: I dont know, wanna smoke some chop chop?
Man 1: Yeah, I guess
Man 3: What's chop chop?
Man 1 and 2: *pause* ..... just smoke it yo!