I'm so shy that you thought I was bashful
But this bastard's flow will bash your skull

from Kanye West (Ft. Common & Talib Kweli) – Get Em High Lyrics on Rap Genius

Meaning

Shy is a play on words: he’s from Chicago, aka, the Chi…so he’s so “Chi”/Shy…

“You thought I was bashful” also refers to the shy dwarf from Snow White and the Seven Dwarfs:

“Bastard’s flow”=no father to his style…Bastard may also be referring to the fact that he’s considered by many to be an “asshole”

Ye then uses bash in the opposite way of shy as in to “bash your skull”.

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