it means you a BAD BOY (or girl)
Depeding on where you live, it could mean you're always ready for a challenge. It also differs how you wear it. Right wrist, left wrist, one pocket or another, forehead, around either leg, and above or below the knee, or wrapped around the knuckles. Gang etiquette is so place specific, be sure what it is when you go someplace new to avoid any nasty surprises, to ask what's up and what's cool where etc.Go on and be your bad self. Just make sure you are ready for the consequences.
Black
Yes, any motorcycle rider wear a black bandanna as a gas mask.
union
If you mean in MGS4 you can get infinite ammo!
he is a blood. gang colors
Leonardo wore a blue bandanna, Donatello wore a purple bandanna, Raphael wore a red bandanna and Michelangelo wore an orange bandanna.
It means you support Grand Fathers Motorcycle Club.
It means you're an OG
That is the correct spelling of "bandanna" (head scarf or neckerchief).
I saw Mitchel Musso had a black bandana which is in his pocket on its back of the pants!
You can buy the bandanna at the tailor in Thieves' Landing for $20.
He does not have a bandanna around his neck