An alliance among Negro's. Generally speaking this will be a gang of some sort, as black people are incapable of civil agreements. Maybe other niggalliances that aren't gangs are happening in Africa, but since nobody has ever been there before, it is impossible to know for sure.
Hood Nigga 1- "Ma nigga, look at dat fuckin bitch niggalion, dat nigga parents are rich, fuckin niggalion."
Niggalion- "NIGGUH, PLEEZ."
Hood Nigga 2- "Look at dis nigga, he don't even know how ta say "Nigga, Plez."