you-know-who
noun
Definition of you-know-who
informal
—used in speech to refer to someone who is not named but is known to both the hearer and speaker We're planning to throw a party for you-know-who.
Indulge Your Inner Word Nerd
Seen and Heard
What made you want to look up you-know-who? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!