Dehogynem is built from the Hungarian words dehogy and nem and is used in everyday speech to push back on something just said, closer to of course not or no way than a polite no. The shortened clip form spread through soundboards and short video edits where a sub second reaction can replace a whole reply. Hungarian speakers recognise the attitude instantly, while other viewers pick it up from context and timing alone. It stays popular because that one firm phrase fits arguments, jokes and disbelief without needing any setup.