As nouns the difference between thingy and thing
is that thingy is a thing (used in a vague way to refer to something whose name one cannot recall ) while thing is that which is considered to exist as a separate entity, object, quality or concept.
Is thingy an actual word?
Thingy is very informal. It's especially used in speech as a way for the speaker to refer to something whose name they don't know or can't remember at that moment.
What's a thingy thing?
: something that is hard to classify or whose name is unknown or forgotten : thing, thingamajig During the session in May 1996, the geophysicist's instruments became the "yellow thingy" and the "red thingy," and the …