No shit, Sherlock!
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No shit, Sherlock!and NSS
exclam. & comp. abb. a phrase said when someone has stated the obvious. (see also Sherlock.) No shit, Sherlock. Everybody knows that!
See also: no
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.