Scooby Doo

A placeholder word for a thing, the name of which is not able to be recalled. Used interchangeably with thingamajig, thingamabob, etc. May also be used to refer to multiple nonspecific items, often of little value or importance.

Could you pass me the... uhh... Scooby Doo on that table please?
Have you remembered to pack all your Scooby Doos for the trip away?