Acronym for "dual income, no kids". Primarily used as a label for individuals who can afford nice things but are also slowly being phased out of the gene-pool.
"Look at the fucker Roody and his new Audi. Dude is such a Dink."
Dink just means for something to be dumb or idiotic. Mostly used by the north east of England (as far as I know) and it's so funny when you put it in a completely unintelligible sentence that would make Americans go cross eyed.