Extreme masterbating 

When you have jerked it so long that it wil pop a boner for the rest of your life.

My dad did a ''Extreme masterbating'' yesterday

Extreme masterbating by WKalas December 29, 2016

extreme masterbation 

masterbating so hard it gives you a nice warm feeling then hurts

guy 1-i did some extreme masterbation today
guy 2-did it hurt?
guy 1 at the end, yes.

extreme masterbation by rob billy June 18, 2011