I'll I'm trying to do is get brain like the scarecrow
On Wizard of Oz,

from Cassidy – 11 Minute Freestyle on Hot 97 Lyrics on Rap Genius

Meaning

The Scarecrow is a character from the Wizard of Oz. In his first appearance, the Scarecrow reveals that he lacks a brain and desires above all else to have one.

So the Scarecrow is trying to get smarter, in other words get brain. But most likely what Cassidy means by brain, is not intelligent, but head… blow jobs. He could mean intelligence, but he’s most likely referring to oral sex

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