Isnt it just when you get your dick plumped up a little so its hanging long and fat like after jelquing and grasp it at the base, kegel a little blood into ur member then grip tighter at the base and bend it and hold for a while, you should see and feel the pressure and expansion
Warning though, dont attempt this with any hint of an erection. Your dick should be plumped up a bit not stiff in any way. I think thats basically it anyway, someone else can prob explain it better though :biggrin1: