When one comes into sudden money and spends it on elaborate and expensive items.
A person who normally has $10 in his pocket, suddenly has $1,000 in his pocket.
Joey usually buys dinner at McDonalds, but he won $1,000 in the lottery so he's niggerrich and paying for dinner for all his friends at an expensive restaurant.
An offensive word that, despite its past usage as an racial slur, is now gaining popularity as a word to describe ignorant, ill mannered, or low-class people, without regard to their ethnicity.
That stupid nigger (21st century definition) just pushed me and didn't apologize! People like that make me mad.