noun Internet Slang

Red Flag

/rɛd flæɡ/ · noun · informal

A warning sign that someone or something has a serious problem — a reason to be cautious.

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Definitions

1

A behaviour or trait, especially in dating, that signals someone could be trouble or unhealthy to be around.

“He talked down to the waiter all night — instant red flag.”
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2

Used online to call out concerning behaviour in videos, posts, or public figures.

“Bragging about never apologising is such a red flag.”
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3

Any early warning sign that a situation, job, or friendship is heading somewhere bad.

“They wouldn't tell me the salary in the interview, big red flag.”
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Red Flag In A Sentence

The way she ignores her friends' advice is a red flag.
No red flags so far, which honestly feels suspicious.
That's not a red flag, that's the whole circus.

Origin & Usage

Borrowed from the literal warning flag used in racing and on beaches, it became dating and relationship shorthand online, exploding on TikTok and X in the late 2010s as the negative counterpart to a green flag.

Variants Major red flagRed flag behaviourWalking red flag
Tags #gen-z#dating#internet#relationships

People Also Ask

What does red flag mean in slang?

A red flag is a warning sign that a person or situation has a serious problem worth being cautious about.

What does red flag mean in dating?

In dating it's a behaviour that suggests someone may be a bad or unhealthy partner, like dishonesty or disrespect.

What does red flag mean on TikTok?

On TikTok people list red flags to call out concerning behaviour in relationships, friendships, or public figures.

Is red flag the opposite of green flag?

Yes — a red flag warns of problems while a green flag highlights positive, healthy signs.

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