When you have a girlfriend, crush, or significant other that talks about doing sexual things but is to scared to do them. They will talk it up and get their partner excited and then chicken out. This is the tease and it makes your penis erect in the process. This type of tease is not a fun tease but is instead a way of torture to the male in the relationship.
You are really going to do that. Leave me with a stick dick, really?