"That nigger". A moronic bastardization of the English language. Also an inflammatory comment, though many are too stupid to understand this.
It's not 'dat nigga'. The proper vernacular is 'that nigger', you FUCKTARDS.
A word hurled both at people who are truly envious of something (often something really stupid) and cynics who don't give a fuck but just like to spite people because said people are dumbasses.
Cynic: Fuck these dumbasses, they're so obsessed with their money and stupid fucking cars.
random dickhead: fuck u ur just jealous nigga
Cynic: No, fuck you, dumbshit. I'm not jealous of your worthless and pathetic lifestyle.