Zaza: meaning weed, or another particular drug that you smoke.
“____ has been smoking the/that zaza.” This means that the person spoken about in the sentence has been smoking weed/another substance. Usually you say this when someone is visibly high.
Person A: “ayo, Samantha looks high.”
Person B: “yeah, she’s been smoking the zaza again.”
She didn't really seem to know much about the movie's plot; we suspected that she spent most of the hour and a half in the dark busily smoking a sausage.