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.