From this article on the subject of "after dribble":
Continence Foundation said...
The loss of a small amount of urine almost immediately after the bladder has been emptied is common both before and after prostate operations and tends to increase with age. It may be because your bladder does not quite empty, or because urine becomes trapped in the bladder outlet, where the prostate used to be, and leaks out afterwards. This problem usually improves with time but may be helped if you sit down on the lavatory and lean forwards to pass urine, or else if you push up behind the scrotum and massage gently to expel the last few drops.
Hot darn, (that's not what I typed, and you know it) it works!