Word of Advice: Leave the smoke grenade and peanut butter at home.

[dragoner]

Someone had to make the hanky code joke...

I don't get it.

 

[Aeson]

I don't get it.

As I understand it's a a way to identify yourself and the kinks you're into to others in the know. What the color means is determined by which pocket it's hanging out of left or right.