I'm on the toilet when I rhyme, if you the shit then I decline

from Kendrick Lamar – Rigamortus Lyrics on Rap Genius

Meaning

Kendrick joins the esteemed “shit joke” club, made famous by Lil Wayne.

He shits on other rappers so much when he rhymes that he’s pretty much on the toilet.

Could also be looked at in a way where he thinks of his rhymes while in the toilet (best place to relax eh) and if you’re the shit then he flushes you.

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