DINK (Adjective) — Small and insignificant. ex. "we stayed in a DINK old hotel"
DINK (Adjective) — (informal) pretty and neat.
DINK (Noun) — A soft return so that the tennis ball drops abruptly after crossing the net.
DINK (Noun) — A small locomotive.
DINK (Noun) — A couple who both have careers and no children (an acronym for dual income no kids).