Green’s Dictionary of Slang

dual income no kids (yet), a social acronym created to describe the ideal couple of the booming 1980s.

1987		Illus. London News Oct. 40: Far from being envied by the fecund but impoverished, Dinkies (Double Income No Kids) are no longer fashionable but objects of sympathy.
1992		K. Lette Llama Parlour 9: I’d won a trip to Hollywood for a walk-on role in this famous American situation comedy called Dinks (Double Income, No Kids).
2000		Guardian G2 8 Mar. 3: Nimbys, dinkies, guppies, puppies.
2021		Betoota-isms 67: 1. Acronym for Double Income No Kids 2. A wealthy, often gay, couple with no children.