Rotted means brain-rotted: someone who has consumed so much internet content their thinking is warped. Often self-deprecating: "I'm so rotted I laugh at any TikTok." Mildly concerning only if your teen actually feels low about their screen time. Common Gen Z self-roast. If your kid uses it constantly, ask them where they first heard it, not to police their speech but to understand which online community they are in.