Something 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-what" in a sentence
"Coming out of college as a second-round draft choice, Viola thought he was "king you-know-what" and often refused help, even when his earned run average was above 5.00 in his first two seasons."
"But when you're the former governor of California who apparently had a lovechild, those catchphrases might be a pain in the Austrian you-know-what."
"You gotta hand it to the Repugnants ... they have more you-know-what than democrats!"