I know it's not #FunFactsFriday.  But why wait?!?!...Apologies on the interruption of #MotivationMonday,#MammaryMonday,#ManCrushMonday & #MasturbationMonday. But knowledge never takes a day off:

-- Modified on 3/2/2015 11:15:05 AM

In my informal education, I learned it as the "dickhead."