Face Wave
When someone punches another person so hard, their face waves painfully.
Dude, that guy punched him so hard, he did a face wave.
Hate Your Face Wave
It is a high speed wave that is used by people who want to flip you off but think it is too vulgar to use the middle finger. The faster the wave the more hate is fueling it. Just because you don't curse doesn't mean that you can't use hand gestures to express your anger.
Kathy was so angry at the drive that cut her off that she gave them the hate your face wave.