If weed got you runnin' your mouth
You better blow that shit out

from Jay Z – I Can't Get With That Lyrics on Rap Genius

Meaning

Jay-Z rarely smoked in his earlier years, in part because of an experience he had with The Notorious B.I.G. that he describes in his book, Decoded

Biggie made a cameo appearance in the 1996 video for “Ain’t no N — – — a,” which Jay-Z was filming with Foxy Brown in Miami just when he started to break. Jay-Z says he looked down on smoking pot as counterproductive, and only did so on vacation. “I could count the number of times I’d smoked trees,” he writes. But when Big asked him to smoke, he said to himself, “Relax, you’re not on the streets anymore.” So he smoked, and got stoned out of his mind just before the video started shooting. Laughing at his formerly sober friend, Biggie leaned in and whispered in Jay-Z’s ear: “I got ya.” It took Jay-Z 20 minutes in his room to gather his wits. Later he told his friend: “Never again my n — – — a.” (New York Post)

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