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A blue flag stands for penis loss. A wise geman person ones said that hoisting a purely blue flag, or at least a blue flag without any symbol on it, indicates that the hoisting person has lost his phallus.
Person A: "Look there, captain, those poor men hoist a blue flag"
Person B: " These poor souls...."
blue flag by YourWiseAdvice April 17, 2022

Bonnie Blue Flag 

The Bonnie Blue Flag was a flag used by Confederate soldiers as an informal military flag, and is the subject of a famous marching tune, "The Bonnie Blue Flag"
Hurrah! Hurrah! For Southern rights hurrah! Hurrah for the Bonnie Blue Flag that bears a single star!

Robert was very proud of himself when he was designated bearer of the Bonnie Blue Flag
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