Definition of "thingy"

thingy

/ˈθɪŋiː/

noun
plural thingies
1. (informal) A thing (used to refer to something vaguely or when one cannot recall its name).
2. (slang, euphemistic, childish) A penis.
  Quotations
  He pulled out his thingy. It was huge.
  2004, Richard Tinsley, Walking on the Son
adjective
comparative thingier, superlative thingiest
1. Resembling or characteristic of a thing; tangible.
  Quotations
  The most unpleasant, and also the thingiest, the central thing in Foreign Parts, was a giant banyan tree, putting out more and more suckers which created tangled arches, a swollen hiding-place of a tree, a series of organic traps, […]
  1985, A. S. Byatt, Still Life
  The secret of even the thingiest SF, the most solid-walnut-to-the-knuckles fantasy, is that you don't need much to summon worlds out of air, so long as the details are the right ones.
  2017, Francis Spufford, True Stories: And Other Essays, page 128
pronoun
1. (informal) A person whose name one cannot recall.