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1.
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?
by Brigham Lee February 01, 2006
 
2.
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.
by cornman6969 December 22, 2009