The Bulldog means: Dick Tricks’s other trick is to get down on your fours after placing the balls and penis between one’s legs. The effect should look like a bulldog male, as the testicles and scrotum hang down below the rectum. Because you must be naked, this trick is considered a difficult trick. You can earn bonus points by pulling a slipper or shoe in your mouth and grinning loudly during this trick. (in Community Dictionary, added by Wesley Bright)