Fuck an acid tab, I'll strap the whole sheet to my forehead
Wait until it absorbed in and fell to the floor dead

from Eminem – 3 Verses Lyrics on Rap Genius

Meaning

Acid users would sometimes break up the tablets and put the crushed product on a bandanna to wear, at which point the person would sweat and absorb the drug through their pores.

The fact that Eminem says “sheet” shows that he intends to take ALOT of acid.

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