When a man or woman has mastered all possible fetishes with the male scrotum, he / she will then be crowned a "scrotum champ". It can also be used as an insult, which is commonly used to target someone's sexuality.
Guy: Hey girl, Rodney told me you were a scrotum champ.
Girl: Well, let's just say i know how to please a man.
Guy: Hey chester, I'll kick your ass you piece of shit.
Other Guy: Atleast I'm not a scrotum champ, faggot.