thingamajig

noun
UK /ˈθɪŋəmədʒɪɡ/
US /ˈθɪŋəmədʒɪɡ/

A thing whose name you do not know or cannot remember.

Can you pass me that little thingamajig on the table?


OTHER MEANINGS

2. A small tool or device used for a job you do not know the name of.

He fixed the sink with some kind of thingamajig from his toolbox.

3. A word used when you forget the name of a person or place.

I saw old thingamajig at the store yesterday.

4. A part of a machine that you cannot identify.

This thingamajig fell off the bike, but I don't know where it goes.