Used to describe a close minded person that will argue for the sake of arguing. They will take a stance against you regardless of the information presented, accuracy is not important. If proven wrong via facts, they will continue to argue and/or attempt to move the conversation to a different topic.
This Reddit user is a fence post. Move along and stop wasting your time.
In Female-to-Male (FTM) transsexuals, any type of penile prosthesis, especially those made of silicone that are made to extend and retract to simulate an erection in the by the owner's manipulation.