Home › Words › W › whosiewhatsitwhosiewhatsitwhosiewhatsit means A person or thing that one does not know the name of.Among words judged in Lexicurio's Arena, whosiewhatsit ranks #16,730 of 42,749 for Qualifying.EtymologyA concatenation of the phrases "Who's he? What's it?"nounA person or thing that one does not know the name of.Definitions & examples from Wiktionary (CC BY-SA 3.0).