On some BMX shit
But not me

from J. Cole – She Knows Lyrics on Rap Genius

Meaning

BMX is a bike sport that involves doing tricks, since he just mentioned “Them other niggas love tricking”.

Other people might love tricking (spending money on a woman) but not Cole! Like he said on “Rise and Shine”

I got her in my bedroom, but cheer up, nigga
You saved so many hoes, you a hero, nigga!

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