When two male friends are having sex with a dead decomposing dog and/or cat. Starts out by both friends inserting their dicks into opposite but symmetrical sides of the animal. While both men are inside of the animal you begin to angrily fuck or "sword fight" inside the animal, not being able to see who's winning or how close the dicks are to each other. Therefore it's like sword fighting in the dark, or a stevie wonder sword fight.
"Hey man, my dog just got ran over by a car... Wanna come over so we can do some Stevie Wonder sword fighting?"