Teen Slang · Dating & relationships

What does “Red flag” mean?

Warning sign about a person, especially in dating. 'Total red flag.'

Where “Red flag” comes from

Long-standing dating vocabulary, intensified by TikTok lists.

Why teens actually say it

Names warning signs to share.

What it means for you as a parent

Healthy framework. Build the conversation muscle for it.

How it’s used

  • “He texted ‘k’ and that’s a red flag.” Spotting an early warning sign in dating. Half-serious caution.
  • “No hobbies at all? Red flag.” Naming a trait that signals trouble in a partner.

← 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.