So when he says "Catch up, nigga" it looks like an accident

from Odd Future (Ft. Domo Genesis, Earl Sweatshirt, Frank Ocean, Hodgy Beats, Jasper Dolphin, Left Brain, Mike G, Taco & Tyler The Creator) – Oldie Lyrics on Rap Genius

Meaning

Here Tyler follows up with the murder theme by making “Catch up” sound like “Ketchup” because of the physical similarities bewtween blood and ketchup to make the scene look like an accident

Tyler is mainly making a reference to a quote from the movie Pulp Fiction, made by one of his favorite directors, Quentin Tarantino.

Specifically, a joke about one tomato stepping on another tomato, and then saying “Ketchup”.

Pulp Fiction joke:
http://www.youtube.com/watch?v=NrGeOHpEGk0

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