Skill issue is gaming slang for telling someone that a loss or mistake came from their own ability rather than bad luck, lag or unfair mechanics, and pairing it with shut up turns it into a sharper, meme-ready comeback. The phrase spread through multiplayer lobbies, Discord servers, Twitch chats and TikTok edits, where short, repeatable insults travel quickly between clips. It has stayed popular because it fits almost any failed play, works without context and lets creators roast a teammate or opponent in under five seconds.