North Korean Fingercuffs
when 2 women are fucking each other with a double-headed dildo and 2 dudes are fucking the 2 women in their respective assholes.

Variance: Add a double headed dildo for the dudes and you got yourself an Escher (as in the his Ascending and Descending lithograph).
Last weekend was crazy, me and Booger pulled off the North Korean Fingercuffs with these 2 crazy bitches.