I'm smoking on the thrax like I got cataracts

from Gucci Mane & V-Nasty – White Girl Lyrics on Rap Genius

Meaning

pretty sure he’s using the term “thrax” in place of anthrax which is a chemical agent that can kill on contact. so basically his weed could kill a normal person and he smokes it so much he looks like he has cataracts or droopy ass stoner eyes.

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