But No

''But no. But nooo-OOOO-ooo! But NOOOOOOOOOOOOOOOOOOOOOOOOOOOO!''

Used commonly after the speaker has asked a question or said a phrase starting with "You think...", then before the speaker says the thing they're upset about. It's phrased often with the "no" stretched out. An example of this would be "You think you'd learn to double jump back to the stage after getting launched. But no. You just have to let Bowser hit you right off and KO you when you're at 23 damage . You suck."

But No is an uncommon way to criticize someone for their stupid actions by pointing out what they could have alternatively done instead while also slightly mocking them for their stupidity. It's a little like Heh., but Heh. applies to moments that unintentionally suggest sexual themes.