ball dialling: if u accidentally dial a number while the phone is in your front pocket and u answer it and it's a person of the opposite sex you have offically ball dialled. Female version is called Vag Dialling.
Guy 1: Oh dude did u get the number of that hot chick?
Guy 2: Yeah I found out I was Ball Dialling her during a meeting at work.
Guy 1: Dude that sucks!