It's an ancient and honorable term for the final step in any engineering project. Turn it on, see if it smokes.
Lois McMaster BujoldAll the worry people expend over not existing after they die, yet nary a one ever seems to spare a moment to worry about not having existed before they were conceived. Or at all. After all, one sperm over and we would have been our sisters, and we'd never have been missed.
Lois McMaster Bujold