who knows what
see under what have you.
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Examples from the Web for who knows what
Historical Examples of who knows what
Like mushrooms, in a single sight we spring up—a pen in our hands, very little in our brains, and who-knows-what in our hearts!
The Complete Essays of John GalsworthyJohn Galsworthy
The little model gave him a look with who-knows-what of reproach in it, and, faithful to her training, went submissively away.
FraternityJohn Galsworthy