The phrase comes from Star Wars: The Clone Wars, the animated series following clone troopers during the Clone Wars, where good soldiers follow orders is repeated as a mantra of obedience drilled into the clones. Clips of the line began circulating as a meme sound because it fits moments of unquestioning loyalty so neatly, especially in short video edits and reaction posts. It has stayed popular because the wording is short, instantly recognisable to Star Wars fans, and works ironically when the order being followed is clearly a bad idea.