doober

(slang, originally, US) A thing (used in a vague way to refer to something whose name one does not know or cannot recall).

A wonderfully specific Midwestern Americanism used in Kansas and Nebraska as a stand-in for any unnamed object — a thingamajig, a doohickey, a whatchamacallit. 'Doodinkus' is the kind of word that sounds made up even to people who use it regularly, which is precisely part of its charm. It belongs to a rich tradition of placeholder words that English speakers reach for when the real name of something temporarily eludes them.

(Australia) Something that one does not readily recall the name of; a whatchamacallit.

(British, informal) Any small electronic device that plugs directly into a larger one, such as a wireless scoring system in fencing or a USB mass storage device.