VERB
1. THE ACT OF TURNING THE POUND (FIST BUMP) UPSIDE DOWN
2. A DIFFERENT FORM OF FISTING WHERE THE FIST IS INSERTED (IN A PALM UP FASHION) INTO THE VAGINA OR ANAL CAVITY
1. THE ACT OF TURNING THE POUND (FIST BUMP) UPSIDE DOWN
2. A DIFFERENT FORM OF FISTING WHERE THE FIST IS INSERTED (IN A PALM UP FASHION) INTO THE VAGINA OR ANAL CAVITY
WHEN TWO PEOPLE GREET EACH OTHER WITH A FIST BUMP, THEN TURN THE FIST BUMP UPSIDE DOWN AT THE SAME TIME, THAT IS CALLED AN UNDERKNUCKLE.
by Segue Taylor March 05, 2020