A wonderful sexual act, with the utmost degree of diffuculty.
The act is successfully performed when a woman is sitting in the toilet facing backwards and taking a shit while giving a man a grumpkin while the man is taking a shit in the tank (an upper decker).
Best performed on a public toilet, "friends" toilet, or at work.
The reverse technique with the woman recieving head on the tank from a man on the toilet is referred to as a cookie monster.
Derived from the words "slutty buffalo," because Seffalo ("sexy buffalo") sounded too much like a horrible infection. Costume consists of furry hat with horns, furry skirt, and furry leg warmers. Perfect for America themed Halloween parties because buffalo and sluttiness are very American.
Those sluffalo look like slutty buffalo!
I loveHalloween because of all of the sluffalo running around.