She crushin' down that powder,

from Mac Miller (Ft. Juicy J) – Lucky Ass Bitch Lyrics on Rap Genius

Meaning

To get even higher, some basers crush down pills like ectasy and inhale it to get a direct high.

She isn’t crushing up ecstasy (molly is already powder which is what Mac mentions) nor cocaine (cocaine is chopped not crushed,) he mentions pills later, which is probably what shes crushing.

Mac could be using crushing in the same sense of “crushing beers” (drinking a lot of them quickly). Crushing powder is redundant. She’s snorting a lot of some type of powdered drug quickly.

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