Definitions by Don't Ask, Please
Boink
v)
During vaginal intercourse, most usually from the rear, when the penis slips out of the vagina and upon attempted reinsertion, instead pokes the cheek of the buttocks.
During vaginal intercourse, most usually from the rear, when the penis slips out of the vagina and upon attempted reinsertion, instead pokes the cheek of the buttocks.
Boink by Don't Ask, Please August 24, 2008