Been shitting up bricks,

from Birdman (Ft. Clipse) – What Happened to That Boy? Lyrics on Rap Genius

Meaning

A play on the banality “to shit a brick” i.e. to be rendered metaphorically (and perhaps literally) constipated by anxiety

Here, he means selling bricks of cocaine to crack dealers, ahem, on a regular basis. Drug mules also pass bags of cocaine through their bodies, literally “shitting” cocaine for days.

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