That thing will go ratt
That boy will lay flat, so flat that act
Is what I perform amongst you haters

from Lil Wayne – Hustler Musik Lyrics on Rap Genius

Meaning

“Ratt” is an onomatopoeia for gunfire, so the first line means that his gun will go “ratt”. Then you will be laying flat on the ground after you are shot.

This is what he’ll have to do if you try him (“haters”).

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