When someone does something really wrong. Or when someone just does something.
No, you don't walk around with no shoes on. You just don't!

Guy: Excuse me, wanna dance?
Girl: No, you don't!
by Sabutay February 28, 2009
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Used to express sarcasm when someone states the obvious, or states a fact that has been delivered like a second ago
Fat man:Dude, I think I have become fat
Dude:You don't say
by cagedidiot July 25, 2013
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literally speaking it is just another way of saying a very commonly and aptly used phrase "NO SHIT". it is when stating the blatant obvious and saying it as if it was just thought of on the spot. It is used to show distaste in a rather sarcastic and underhanded way and if said properly can be funny to no ends.

a master of this would be Christoffer!!
person 1- sir i dont think the bomb exploded
Person 2- what gave that away, the lack of noise? or the lack of mushroom? or the lack of the afterwave?
person3- it was the no mushroom for me.
person4- you don't say!!!

at an airport gate waiting to be let into the flight
Person 1- so dude we are going on gate number 15 rite?
person 2- oh yeah so lets join the queue for gate 15.
after reaching the near end of the line
person 3- i think we have reached our gate
person 1 and 2- You don't say!!
by ronnie1234 November 05, 2010
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When a childish person (most likely a fuck boi) says some bullshit ass statement. The statement may represent something very queer and or ignorant.
Fuck boi: I had like 3 smirnoffs last night and boned a couple dimes. Wild night.

Alpha Dog: Boy If you don't. You were definitely playing world of war craft all night.
by I hate a pussy February 27, 2016
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What you say at the start of a question to influence the answer (usually to suit yourself)
Instead of asking "do you want..."
Passenger: "You don't want petrol money do you?"

Driver: "Ummm... no, course not..."
by Ozzy01 January 15, 2011
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