from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A mechanical device or part whose name is forgotten or unknown; a gadget.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A nonsensical placeholder name for something that one does not know the proper term for; gadget; whatchamacallit; thingamajig.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. something unspecified whose name is either forgotten or not known
- n. a device or control that is very useful for a particular job
Origin unknown.(American Heritage® Dictionary of the English Language, Fourth Edition)