She movin' fast for them 20s, she choosin' up for them 50s
from King Louie (Ft. Juicy J & Pusha T) – My Hoes They Do Drugs Lyrics on Rap Genius
Meaning
Depending on how much money you give her, she reacts differently

These bills make her move her body fast(shown at strip clubs). Shake her ass faster, lap dances, tits in your face, etc..
But…

These bills make her go home with you. She chooses who she will be spending the night with according to 50 bills.
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