What is a hanky code? Have you ever heard of the hanky code? Maybe not, unless you are freaky and into kinky sex/kinky play. The hanky code is also known as the bandana code, handkerchief code, or flagging. It is a non-verbal way of communicating sexual preferences, kinks, and fetishes. It is highly popular in the LGBTQ Leather community. I promise if you ever went to a play party in the queer community you will see someone flagging. The traditional way of flagging of hanging a bandana out of the back pocket. However, there are several other ways to flag. The bandana can be wrapped around the wrist, made into a flower pin, hair bandana, and many more.