Two white cups and I got that drink
Could be purple, it could be pink
Depending on how you mix that shit

from DJ Khaled (Ft. Drake, Lil Wayne & Rick Ross) – I'm On One Lyrics on Rap Genius

Meaning

Famous concoction, popular in the South, is a mixture of prescription strength codeine-promethazine cough syrup and Sprite. It is referred to as purple drank, lean, barre, and syrup (or sizzurp.)

The variation between purple and pink comes from whether or not you “mix that shit.” The Sprite lightens the color of the purple syrup, making it pink, typically when there’s less syrup.

(Note the 2 white cups Drake holds in the beginning of the video)

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