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A crips bandana, flag or otherwise used bandana.
Don't want to wear my blue flag in the hood, for fear that a blood might shoot me while suspecting me to be a crip.
blue flag by Wutwutwutwutla July 19, 2006
Generally a blue bandana, most commonly used by Los Angeles street gang known as the Crips.
"You see the blue flag in his left pocket? That's a Crip."
Blue flag by VQC BK December 18, 2009
1. A Blue bandana, a standpoint marking for the street gang called "Crisps" in los angeles

2. A moment raised whenever there are usual signs to show that the guy/girl are going to be eventually cucked; rejected for someone else for pretty obvious reasons
1. you better watch out for them, he's got a blue flag; he's part of a street gang.

2. it is usualy a blue flag in anime where one of the main love interests for the main character in the anime is a childhood friend, their going to be rejected for the suddenly new person, or which ever (girl/guy) is bigger on the poster.
Blue flag by WhiteEden January 4, 2019
A fag hag, in gay slang, a woman who associates either mostly or exclusively with gay and bisexual men.

Blue flags are frequently stereotyped as outgoing women who are seeking a substitute for heterosexual relationships, or who are secretly (or openly) sexually attracted to gay men. In fact, many women who identify as blue flags are already in romantic relationships, either with straight men or with women, but seek out the alternative experience of socializing with gay men.
She's a 10 but she's a blue flag.
blue flag by anonymous March 23, 2023
Someone/something that is so extremely sketch that it is beyond the classification of a red flag.

Originates from the railroad practice of using blue flags on trains to signify to people that a locomotive and anything connected to it should not and cannot be touched by anyone other than it's crew.
Guy 1: "Bro, I just started reading Burrows and Mark is so fucking hot."
Guy 2: "Don't bother, he's a blue flag."
blue flag by country_cooker March 18, 2024
The bringer of vibes, the pusher of plans, the asker of more!
Satish made this Goa plan happen, he’s a walking-talking blue flag”
Blue flag by Leo Burnett July 12, 2024