An IT term for a demo of a computer program given to stakeholders or important clients before the program is actually done. The demo is sure to fail and certainly cost your project buy-in and/or it's reputation. A demopocalypse is most often brought on by asshat managers or sales people who didn't even bother to ask for the current state of the project before promising a demo.
Question: Are you still working on that new sales logic system for client x?
Answer: No. Our CIO promised a demopocalypse to the stakeholders and they pulled the plug on our funding. Mind proofing my resume?