The 'They Know What Is What But They Don't Know What Is What They Just Strut' meme originates from the lyrics of Fatboy Slim's 2000 hit 'Weapon of Choice.' The phrase gained legendary status primarily due to the accompanying music video directed by Spike Jonze, which features actor Christopher Walken performing a surreal and highly choreographed dance through an empty hotel. In meme culture, these lyrics are used to poke fun at individuals who project an aura of total competence and swagger while being fundamentally clueless about the actual situation. It serves as the ultimate anthem for 'fake it till you make it' energy, often paired with images or videos of people, animals, or characters walking with exaggerated confidence despite having no idea what they are doing.