A gang call of the Bloods which is supposed to imitate a gun noise. The alternate form is BLAT. Not to be confused with brat, a spoiled child.
In contrast, the Crips have ccccclat or clat, which is also supposed to be a gunshot sound. Other Blood gang calls include "suwoop" and "CK".
Guy: That lil boy is a brat.
Crip: A WHAT?
Guy: He's, uh, very spoiled.
Crip: Oh, I thought you said he was a slob.
Suddenly a Blood ran in and shouted, "Brrrrrrat! SUH WOOP!"
The distinct sound of a Gau-8 30mm cannon dispensing democracy at 3900 rounds per minute. Also known as "The sound of freedom". Used as a form of verb to describe something/someone being completely vaporized by the Gau.