Tobacco; a bowl of tobacco and weed.
John: Do you want any chop in your bowl?
Guy: Nah I just want straight greens
What brass players call their lips. If their lips hurt from too much playing, they're "out of chops"
"Can you hit that high A?"
"Not today, my chops are gone. "
to smoke a bowl of weed usually from a bong or pipe
me: yo come over lets chop
him: shit bro that was the biggest chop ive ever taken