Definitions

1. noun

a mysterious or unidentified object or thing; an enigmatic gadget or device

“The old man fiddled with a whatzit on the shelf, trying to figure out what it did.”

2. interjection

an expression of puzzlement or curiosity

“Whatzit? I’ve never seen anything like it before.”

3. noun

a colloquial or informal term for a gadget, device, or innovation

“The new smartphone is a whatzit, but it’s definitely changed my life.”