Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
TWL06 (NASPA List 2006)
"Whosit" Definition
noun
A thing (used in a vague way to refer to something whose name one cannot recall, or that one is embarrassed to say).
Source: Wiktionary
A specific person (used in a vague way to refer to someone whose name one cannot recall).
Source: Wiktionary
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