ohnosecond

(Oh No! second) That tiny fraction of a second it takes for you to realize you've just made a big mistake on the computer. For example, you just clicked "No" when prompted to save the document you've been composing all day. Or, you just clicked "Send," and forgot to delete the profanity you wrote at the bottom of the e-mail message to your boss.

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(unit, humour)

ohnosecond - (Presumably a play on "nanosecond") The miniscule time it takes to realize that you've just made a BIG mistake like typing rm -rf * in the wrong directory. Seen in Elizabeth P. Crowe's book, "The Electronic Traveller."