A buttox is also a booty, a booty is also known as a pelvis, a pelvis is also known as a bum, a bum is also known as gluteus maximus and that is the thing you use to shake in peoples faces.
When the old British people got angry at how people kept using the word ass a lot, they ruined the word and changed it to Buttox.
By Kali
Buttox
An instance where someone has had botox on their forhead area but the muscles have contracted (then been frozen in place), forming a verticle frown line, much like a butt crack. Hence buttox.