It is a black dinosaur that roams the earth today in search of its prey. Today, it is used along with the word shidiot to lower an individuals self esteem. It is not racist by any means. It just adds emphasis to an already demeaning term.
It is a combination of two words:
Nigro which means black in latin.
And philia that means love or attraction.
Making it Black love which is love of black people/africans/afro-americans/jamaicans ETC...