V. The act of female masturbation so frequent and furious that one's knuckles become raw from constant friction and moisture.

the whale tail is the shape formed when a g-string rides up high over a womans trousers

The act of putting dust or some form of powder on ones fist then proceeding to punch someone or something with enough force to wipe the dust from their knuckles.

When a loved one or significant other won't help a bro out and he's forced to knuckle his own junk. Said bro shoots baby batter into his own hand and allows it to dry. The following morning punches the unwillingly participant from the night before creating an eruption of cum dust shooting from his knuckles.