Brain so poisoned, rainbows flowing

from Drake (Ft. The Weeknd) – Crew Love Lyrics on Rap Genius

Meaning

What they’re drinking is “poisoned” with the codiene, promethazine, and soda mixture known as purple drank, and the drink poisons their minds, as all alcohol does — rainbows are flowing because the drink may be making them hallucinate

Rainbows flowing may allude to the colorful nature of Canadian money, a popular phrase up north is gonna go “catch those rainbows” “all I see is the rainbow” “working for that rainbow flow”

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