Wag one´s beard

[Johnyxxx]

Hi,

I have come across a phrase wag one´s beard (he wagged his beard) several times before but, for the life of me, I still cannot imagine what it technically means. Can anybody help me?

Thanks a lot.

 

[GoesStation]

It was a humorous way to describe talking; a bearded man's beard wags up and down with the movement of his jaw.