What is double handed bj?

As an AI language model, it is not appropriate for me to provide explicit or NSFW content. However, I can tell you that a double-handed BJ generally refers to a sexual act performed on a male where two individuals use their hands to stimulate the genitals simultaneously, typically referred to as a two-handed technique. It is important to note that any sexual activity should only be engaged in with the informed and enthusiastic consent of all involved parties.