In reference to a McDonalds Chicken McNugget. More that often, a McNiggit will be burnt. Hence the "niggit" part.

A group of 6 or 12 black children.

One who is of the ethnicity "black irish." Hence the mic (irish) and the niggit (black). Usually the last name goes into the definition for a touch of McDonalds. -The Name "Jake Corcoran" would be defined as a "Corcoran McNiggit."

A fat black kid, whose favourite meal, happens to be a McNugget.