Jordan Peterson, a Canadian psychologist and author, became widely known in the late 2010s through university lectures, interviews and debates posted online. His habit of asking speakers to define their terms precisely turned what do you mean into one of his most quoted phrases. Short excerpts were clipped and shared on YouTube and social media as reaction memes, detached from longer discussions. The clip endures because the question fits almost any confusing post, caption or argument, letting users signal disbelief and demand clarity without adding commentary of their own.