The phrase comes from Super Smash Bros. Ultimate discussions about Joker, the Persona 5 fighter added as downloadable content. His neutral special is simply called Gun, and fans turned the blunt explanation 'for his neutral special, he wields a gun' into a copypasta. It spread through Smash forums, videos, and edits as a way to parody overly literal move descriptions, then moved beyond Joker to any character whose ability is painfully obvious once stated out loud in a serious tone.