Do you mean sounding? As in taking a metal rod and inserting it into the urethra?
Using something like
this?
That's a good time. Never heard it called stirring before. But yes, use plenty of sterile lubricant, and ideally let gravity pull it down and into the urethra. I've done it enough to know I like it, but not enough to be bored of it. It's a different kind of violation, and quite a good mental trip to see it disappearing inside the thing that usually disappears inside other things.