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Ohnosecond is a slang term for a type of epiphany in which a technology user realizes they have misused technology and lost large amounts of data or records of their work. It might also be used to refer to other gaffes, such when a user sends an email without including the intended attachment. The word mashes together "oh no" and "second" to refer to that split second when a user realizes his or her mistake.
The term is believed to have been coined by Elizabeth Powell Crowe in her book "The Electronic Traveler" (1993).