Green’s Dictionary of Slang

nigga n.

also niga
[nigger n.1 (1); the sp. is now exclusive to the world of gangsta adj. rap where the SE sfx -er is transposed to -a, a foreshortening that is regularly found in black sl. as a means of intensifying a term (cf. player n. (2)/playa n.) and is thus used in a non-derog. way]

1. [1970s+] (US black) a black person; thus pl. niggaz.

2. (US campus) a close friend, only used among exclusively white or black groups.

In derivatives

niggalicious (adj.) [-licious sfx]

[2000s] (US black) of a black woman, heavily built.

In compounds

nigga chops (n.) [chops n.1 (1)]

[2000s] (US black) a fellow black person.

In exclamations

nigga please!

[2000s] (US black) an excl. of disbelief, dismissal.