ciao Arrigo

guarda un po' che ho trovato?

http://idioms.thefreedictionary.com/wags
cause (some) tongues to wag
Fig. to cause people to gossip; to give people something to gossip about. The way John was looking at Mary will surely cause some tongues to wag. The way Mary was so scantily dressed will also cause tongues to wag.
See also: cause, tongue

set tongues (a)wagging
Fig. to cause people to start gossiping. The affair between the boss and her accountant set tongues a wagging. If you don't get the lawn mowed soon, you will set tongues wagging in the neighborhood.

È possibile che la tua intuizione sia giusta, e che "wags" sia soltanto un modo per dire "le malelingue".

Ciao :-)