from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. something one does not remember the name of
from The Century Dictionary and Cyclopedia
- n. Same as thingumbob.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. something unspecified whose name is either forgotten or not known
thingum + -y. Compare thingamabob and thingamajig. (Wiktionary)