A death resulting from the repeated action of beating someone wildly with your penis. The coroner's report usually shows multiple mushroom shaped bruises to the skull region.
Gentleman: Guys, I am getting charged with first degree manhoodslaughter. I may be canned for a number of years.
Friend: What is that?
Gentleman: I accidently killed my girlfriend last month. She wouldn't swallow my load so I started beating her senseless with my man pipe. I stopped too late and now am facing that charge.