A phrase originally coined by Guile from the Street Fighter video game franchise, it was his tag line after defeating an opponent. Over the years, it has come to be used also when referring to someone who is past their prime at whatever it is that they should do.
Steven: "Hey, did you watch TNA Impact last week?"
Michael: "Yeah, I can't believe they had Ric Flair's 60-year-old ass wrestling again. He's way past his prime He should go home and be a family man."