Sinse “poontang” is a common slang reference for women of a certain bent, “poonstache” refers to a man's stable of women that are always available to take care of him.
My current roommate has an expansive list of “poonstache” that are always available to him for any reason that he desires.
A gesture made with the hand by placing the tips of the thumb and index finger together. Like forming the "okay" sign but shown from the backside and below the shoulder. The idea is to get another person to glance at it, earning the right to punch them in the arm. The poonstance can be negated however by the viewer putting his finger through the ring that is made by the thumb and index finger. From a game often played by young adult males.