When you take a woman's nipples and place one on each eye like you are looking through binoculars and try to adjust the focus. This is normally done in a strip club and is better thanmotorboating.
This is horrible abuse to do to a person. You rub your knuckle against either your own, your victim's, or a third parties butthole then proceed to rub your "dirty knuckle" against your victim's mouth.
Taking your fists pressing them together where both tips of your knuckles are pointing out and creates a V shape. Another person does the same and you press your knuckles together making a Diamond and insert the penis and proceed to have sex with it