Definition

An exclamation expressing the moment you realize you're completely and utterly screwed, usually with comedic timing and no way out. Often used ironically when a minor inconvenience happens or dramatically when actual disaster strikes.

Example Usage

I forgot my presentation at home and I'm already in the meeting—oh noes!

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=oh%20noes%21&defid=951139)