chackmate

What you say, in closing, when you're pretending to be a stupid person who thinks they're making a clever argument. Usually as a hashtag following a pastiche of a dumb-person interlocutor you imagine you're arguing with.

Etymology: the first confirmed ironic usage was by @gbowie3 on September 30, 2012:

well in America we invented democracy, capitalism, freedom and the number one nation in the world #MERICA #ChackMate