what you call things you don't know the proper name of. see also "doo-hickey"

All purpose substitute word when you can't think of the right one. See Brain Fog.

This little thingy is a link to an explanation of the term

Thingy was an indie rock band formed after the dissolution of Heavy Vegetable in 1995 by Heavy Vegetable veterans Rob Crow and Eléa Tenuta.