What Does ‘Green flag’ Mean?
A green flag is a sign that someone is kind, trustworthy or healthy to be around, the opposite of a red flag.
Dating & friendships noun
Examples of ‘Green flag’ in a sentence
- “He remembered my allergy. Green flag.”
- “Being honest about mistakes is a green flag.”
Where does ‘Green flag’ come from?
Created as a counterpart to "red flag" and spread on social media. First use is unclear.
How to use it, and when not to
Use it to appreciate good behaviour in friends or partners.
For parents and teachers
Fine around parents and teachers. Safe and positive.
Related slang
Frequently asked questions
What does Green flag mean?
A green flag is a sign that someone is kind, trustworthy or healthy to be around, the opposite of a red flag.
Where does Green flag come from?
Created as a counterpart to "red flag" and spread on social media. First use is unclear.
Is Green flag OK to say around parents or teachers?
Fine around parents and teachers. Safe and positive.
How do you use Green flag in a sentence?
He remembered my allergy. Green flag. Being honest about mistakes is a green flag.
More dating & friendships slang
Bestie, Breadcrumbing, Ghosting, Pookie, Red flag, Rizz. Or browse the full A–Z / try the Slang Translator.
Sources
Definition written by VibeDex. Slang changes quickly, so this is a snapshot. Last reviewed 2026-10-23.