No Shit, Sherlock! Share definition Flag A way of saying " No Duh " or " Obviously " but in a mean kind of way or sarcastically Guy: What color is the sky? Girl: Blue ./?Guy: No Shit, Sherlock! No Shit, Sherlock! by SRS111222 February 17, 2012 0 0 Get merch Get the No Shit, Sherlock! mug. Buy Now — $32.95 See more merch