If you hear the term piff weed it usually mean marijuana in general. Piff weed can be low grade marijuana or high grade marijuana. You may hear people say "do you have piff" or "Where can i buy some piff". More and more people are starting to say the word piff its fairly unknown and cops dont pick up on it well. So basically Piff is weed in general. Most smokers just use the word exotic fire haze loud or skunk but most often they say bud. Real marijuana smoker usually know these terms.