WARNING: jowlers can cause enormous headaches, and perhaps whiplash.

jow-ler- n. an image created when the subject of a photo shakes his/her head violently from left to right continuously, causing the skin of the mouth and cheeks to flap, creating a distorted and often disturbing image whilst the picture is being taken.

Apparently this past-time has become so popular that the Jowl Brother's web site is under construction. www.jowlers.com