whosis

a person whose name is not known or cannot be recalled.

It's the strappingly handsome and charming whosis coming this way on his motorcycle.

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whosie-whatsit

a person or thing that you know but have forgotten his or its name.

I met a whosie-whatsit yesterday. I cannot recapture his name right now.

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Whosie dingle

A reference to any person. A generic reference for a person.

I saw whosie dingle handing out pizza rolls at the party