oral castration

The act of using ones mouth to bite/tear off a person's (generally a male's ) genitalia and/or penis thus resulting in immense pain/suffering, and, in some cases, coma or death.

Rick: "Did you hear what Stacy did to John when she found out he was cheating on her?"
James: "No! What happened?"
Rick: "Apparently she was going to give him head but actually gave him an oral castration!"
James: "Dang! That had to hurt!"