Person or entity whose name one does not want to mention but which is known to the person to whom one is speaking.(pronoun)
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Use "you-know-who" in a sentence
"on Twitter, and got hooted at plenty not that I blame anyone, but might the Colts be tempted to call you-know-who in Hattiesburg, Miss., if Collins struggles through another debacle or two like Sunday?"
"I never thought that someone might have a spiritual telephone with a direct line to you-know-who."
"Yakuma and you-know-who are now standing back to back, holding their ground, she with her blades and him with his bat."