I got that wording from a recent Facebook thread. Facebook is on fire right now with this topic.
I did find this on the WPA website:
http://www.wpa-pool.com/web/index.asp?id=116&pagetype=rules#1.6
1.6 Standard Call Shot
In games in which the shooter is required to call shots, the intended ball and pocket must be indicated for each shot if they are not obvious. Details of the shot, such as cushions struck or other balls contacted or pocketed are irrelevant. Only one ball may be called on each shot.
For a called shot to count, the referee must be satisfied that the intended shot was made, so if there is any chance of confusion, e.g. with bank, combination and similar shots, the shooter should indicate the ball and pocket. If the referee or opponent is unsure of the shot to be played, he may ask for a call.
It would seem that the referee's opinion of what was intended, what ball and what pocket was intended by the shooter, is what counts in the end.
Oh, make that referee, TD, or whatever word you want to insert there. I'm talking about the shot guy with the mullet haircut.