Bud of highly unpotent marijuana
that at most will give the smoker a headache. Usually characterized by an exceeding presence of stems, seeds, and leaves. Usually accessible to low-level dealers; if your buddy picks up a half-ounce of this, tell him to get his money back.
I picked up some dud bud off my friend's friend, smoked 3 grams of this crap and I didn't even get a buzz.