Brux more, puff less...
I have no idea what that means and I'm genuinely intrigued.
It's the rat fanciers version of "Wag more, bark less". Bruxing is rhythmic tooth-grinding noise that is sort of the rat equivalent of purring. A rat that is posturing or threatening will often make short, sharp puffing noises as part of their display.
Ahhhhhh.... thanks for the clarification!