The phrase shotgun knees comes from League of Legends champion Urgot, whose six mechanical legs each house a shotgun that fires as part of his Echoing Flames passive. Players shortened that visual joke into a meme name, and short blast clips began circulating on soundboards and in gameplay edits. The sound stays popular because it sums up Urgot in one gag, turning his slow, stomping movement into something instantly recognisable for League fans and funny even without context for everyone else watching a short edit online today.