slang Any person or thing whose name is not known, cannot be remembered, or is being avoided. A: "We have to talk to Ms. Whosit again to see what she remembers about the incident." B: "You mean Ms. Martens. I'll reach out to her in the morning." Tom said to make sure you don't leave that whosit on overnight, or it could short-circuit the whole building. A: "They're having a meeting about whosit at the moment." B: "Ah, I understand. Let me know when they're finished."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.