Etymological Note: From the colloquial nigga, nigger, probably due to a transition to a more closed velar sound, from g to k, but also possibly an intentional misspelling intended to foil keyword-based content filters.
Citations:
1999 Bishop023@webtv.net Usenet: rec.music.hip-hop (May 20) “Re: the best in Hip Hop One Hit Wonders…”: Ed is my nicca 4 life i love that critter. 2003 Mr. Oysterhead totally un-inspired (Aug. 9) “oh siht in the middle of bashin sumone…well just see for yourself”: Tell Devon and Bran i say “wut up niccas” and…uhh…yeah that be it. 2004 [gnosis] UK Urban Music Forum (Aug. 13) “King Of Advanced: butta v gnosis”: I just hopped on the employment train, so I been a busy ass nicca. 2004*muah* (Aug. 27) “iF yUh FeEliN’ l1kE a PiMp.. NiCcA gO n BrUsH yO sHoUlDeRz oFf!!”: (title)