tell so what to do with sth
tell (so) what to do with (sth) definition
to tell someone to do something rude with something. (With the unspoken notion that one should stick it up one's ass.) : If that's the way he wants to be, you can just tell him what to do with it.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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