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informal Any thing the name of which is not known or cannot be remembered. Hand me that whatsis over there, would ya? He said some whatsis in the engine blew out or something.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
whatsisand whatsit and whatzit and whazzit (ˈʍətsɪs and ˈʍətsɪt and ˈʍətsɪt and ˈʍəzɪt)
n. a name for a person or thing whose real name has been forgotten or is being avoided. Put this little whatzit on the top and another on the bottom.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.