acronym for double income, no kids, popular from 1987.

dink (n.1)

"drop-shot," in lawn tennis, 1939, probably somehow imitative. As a verb by 1942. Related: Dinked; dinking.

dink (n.2)

derogatory for "Vietnamese," 1969, U.S. military slang, of uncertain origin.

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Definitions of DINK from WordNet

dink (n.)
a couple who both have careers and no children (an acronym for dual income no kids);
dink (n.)
a soft return so that the tennis ball drops abruptly after crossing the net;
Synonyms: drop shot