Come and listen to my story, I gots a lot of shit up on my mind
I wipe the boo-boo from my brain then I finish up my rhyme

from Outkast (Ft. Andre 3000 & Big Boi) – Myintrotoletuknow Lyrics on Rap Genius

Meaning

“I have a lot of shit on my mind” usually just means that you have a lot on your mind, but André chooses to take the phrase literally here. So before he rhymes, he has to wipe the “boo-boo” (slang word for shit) off of his brain in order to get this shit off of his mind before he starts rhyming.

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