A costume nigger is a person who is frontin' and who has forgotten their roots.
The term is often used when referring to others in a derogatory sense.

You will frequently hear it in rap songs such as those by Busta Rhymes i.e. Anti-up.
Djembe: "Just look at that costume nigger, he be frontin' all over town"

Toke: "Man look at his threads, did he forget what 'King' strived for?!

Djembe: "He ain't no 'G', working for the white man in them those banks there, shit"

Toke: "This shit makes me sick to my stomach, ima holla at you bro"

Djembe: "Ain't no thing"
by D.R.E_9.0 January 22, 2014
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