Thanks, mikea105 - maybe you're right, who knows ? :-)
You know, it never occurred to me that this sort of urinary extraction double entendre might not be understood that side of the pond.. maybe an educational parody to the tune of Judas Priest's "Breaking the Law" is called for.
@mikea105
Same thing for "hair of the dog".
http://en.wikipedia.org/wiki/Hair_of_the_dog
Like I mentioned the other day, no need to fret that Dilbert is an American strip, there are plenty of things that Americans (including myself) don't get either.