Little is confirmed about where ehh mazing was first recorded, so its history is mainly in how it spread as a short reaction clip on soundboards and in edited videos. The mispronounced, drawn out delivery made the phrase easy to recognise and reuse, even without a known character or scene attached to it. Creators started dropping it over gaming highlights, fails that turn into wins and everyday surprises, where the sarcastic amazement fits almost any outcome. Its popularity comes from that flexibility, and from how quickly viewers understand the joke.