Its a term I heard while growing up in the ghetto (Compton, CA). It refers to the situation that is often common with black women having babies by large quantities and the euphemism implied to the vaginal canal and the slang term for black babies combined.
"That fat negra has a nigglet canal; she can't stop popin' them chilin' and boy does she collect that welfare check."
by Urielly August 27, 2009