Occurs during copulation between two homosexual males. The penetrating male inserts his phallus into the anal cavity of the reciever with great force. Quickly after forced insertion, the excrement covered phallus is quickly removed and violently slapped across the back of the receiver (much like the removal of the internal material from a pumpkin during the Western religious cult holiday of Hallow's Eve before carving). The excrement is quickly set ablaze, completing the act of a "Gay Pumpkin".
Want to know the real principal of 'Scorched Earth'? Gay pumpkin.