Teen Slang · Dating & relationships

What does “Green flag / Red flag” mean?

A 'green flag' is a sign someone is healthy to date or befriend; a 'red flag' is a warning sign.

Where “Green flag / Red flag” comes from

Therapy and relationship language that flooded TikTok around 2021 in 'flag' list videos.

Why teens actually say it

A simple framework teens use to evaluate friends and crushes.

What it means for you as a parent

Actually healthy. Reflects real awareness of relationship dynamics — a great conversation starter.

How it’s used

  • “He texts back and remembers little things, total green flag.” Spotting healthy signs in someone. Hopeful and thoughtful.
  • “He was rude to the waiter, big red flag.” Catching a warning sign early. Cautious and aware.

← Browse the full A–Z teen slang glossary (500+ terms)

Contact us Have a question? Need help? Send us a note — we read every message.