Grinding one out.
When in doubt stroke one out!
Finally edged one out
Pumping one out
Rubbing One Out
One in one out
One in one out
Squeezing one out
one boob out
One in One out
... rubbing one out in the shower.
Letting one out
Rubbing one out in the woods
Rubbing one out
Rubbing one out
Saiko Rubbing one out
Hole in One
Pumping one out