a nigger who resembles a rat either by rat like actions, or just simply looking like a rat.
Oh shit bro, did you check out that sick ass nigrat?
ayon kay Brigham Lee ika-01 ng Pebrero, 2006
A combination of a black person and a rat. "Nigrat" refers to a poor black person that is homeless.
I gave that black nigrat some change on the street.
ayon kay cornman6969 ika-22 ng Disyembre, 2009