They asked me what it was, I told them fuckers it was ketchup

from Tyler The Creator – Tron Cat Lyrics on Rap Genius

Meaning

Someone noticed blood on Tyler’s shirt, so he covered himself by telling them it was Ketchup

This line is also referring to the previous line were he says “They will never catch him or catch up” using clever wordplay Tyler is saying it is neither “catch him” or catch up" but Ketchup

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