Definition - What does Ohnosecond mean?
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).
Techopedia explains Ohnosecond
Other kind of ohnoseconds happen when a user just doesn’t pay attention to the controls for a particular system. Many different kinds of technologies on computers, mobile phones and tablets have delete keys. Some of these may have backup commands or other screens that come up to confirm erasing something, so that the user has another chance to reconsider whether they pressed the right button. Although software often attempts to reduce ohnoseconds, user error can never be completely eliminated, so ohnoseconds will always be a part of working with technology.