Ohnosecond meaning

(OH NO! SECOND) The fraction of a second it takes to realize you just made a big mistake on the computer. For example, clicking "No" when prompted to save the document you spent all day composing. Or, accidentally clicking "Send" on the email you typed to vent your frustration. See undo send.
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(humorous) The fraction of time between making a mistake and realizing it.
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Origin of ohnosecond