Are you seeing what I’m seeing?
This booth is a crime scene
Chalk off the mic, the kill screen is my screen

from Childish Gambino (Ft. DC Pierson & Nick Packard) – Assassins Lyrics on Rap Genius

Meaning

A recording booth. Could also be a reference to John Wilkes Booth (an assassin, so it’s not far-fetched), but not directly, as there’s no other context for it.

Chalking off a crime scene to avoid evidence tampering is/was a common practice. Also, bodies are often removed from crime scenes while investigation is still in progress, so a chalk outline provides a stand-in for the body so that detectives have a context.

A kill screen is a bug in a video game that ends the game.

DC is saying that he has killed the mic with his lyrical swag.

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