Beating Blister
A sore spot found on one's penis as a result of masturbating excessively.
I spent all weekend masturbating and suddenly I had a beating blister.
Beat Off Blister
The blister you get on your pecker shaft when you've masturbated so hard and so much. It only gets worse if you keep beating off. But why would you when it makes your Peter popper poop so good?
I don't have a girlfriend. I only have beat off blisters.