Girl shake that ass like a donkey with Parkinson's
Make like Michael J. Fox is in your drawers, playing with an etch-a-sketch

from Eminem (Ft. Pink) – Won't Back Down Lyrics on Rap Genius

Meaning

LADIES: shake your ass!

Michael J. Fox is a famous actor that has Parkinson’s disease, a nervous system disorder that causes the sufferer to often shake uncontrollably

An Etch-a-Sketch is a toy that you shake to erase pictures that you’ve made on it, further adding to the shaking

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Also, ass is another word for donkey, and one who used an etch-a-sketch could be called a “drawer”

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