Stop the cap is internet slang for stop lying, popularised through short reaction videos and meme edits where a creator calls out an obvious exaggeration. The phrase spread on TikTok and in gaming and chat culture because it is short, direct and easy to drop over almost any boast or tall tale. This version leans into that humour with a stretched, playful ending that makes it feel like a joke rather than an argument. Like bruh, it works as a one-line response that needs no explanation, which is why creators keep reusing it for reactions, roasts and duets.