Mama hope for Ivy Leagues, instead I was rapping tracks
Get at poison ivy green, even though I'm Batman Black

from XV – One of One Lyrics on Rap Genius

Meaning

His mother hoped he’d attend an Ivy league college, He wanted to rap instead and follow his dream, contrary to her wishes.

Ivy is green, possibly a money reference. He also compares his skin to the darkness of Batmans costume.

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