Decoration or ornamantal item .
Frequently a smallish article whose ususal name is unknown or forgotten, a gadget. Synonym:Whatchmacllit. Perhaps a derivative of doohickey. Doodad + hickey. Hickey in the sense of being a device or contrivance or a gadget.

A little doo dad by Dorothy Parker...

The sun's gone dim, and
The moon's turned black;
For I loved him, and
He didn't love back.

from Two-Volume Novel

Dorothy published more than 50 poems in The New Yorker magazine, and many of them were efforts she described as "doo-dads": "I write doo-dads because this is a doo-dad kind of town." she said

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