Something or someone one does not wish to name, usually because it is both obvious and indelicate or taboo; whatsis: They were knocked on their you-know-what/ A Rhodes scholar, he earned his law degree at Yale (like you-know-who)(1605+)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
Idioms and Phrases with you name it
you name it
Everything one can think of, as in We've got a crib, highchair, diapers—you name it.
[ ; mid-1900s