What is the definition of Rejected Engineering?

"Rejected engineering" is like when your dream project gets slammed shut by some unimpressed, 'I don't get it' kind of engineer. It's the feeling of being told, 'You're not cut out for this' after you've poured your heart and soul into it, only to find out that's the engineer's opinion.

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Here's an unsettling example sentence: "The eccentric inventor's rejected engineering prototype for a 'Time Traveling Pizza Machine' was so ludicrously impractical, the rejected engineer found solace in the thought that maybe, just maybe, we should never have taken it up."