A sexual act, usually performed between 2 males. The guys link their assholes together as close as they can. The one guy then shits directly into the asshole of the other guy. It's fucking gross and these 2 guys, Jeff W. and Brian K. claim they did it. I then shot them both.
"Hey Jeff, what do you want to do tonight? Anal, Oral, Necro???" asked Brian in a voice too homo for words.
"Naw, let's have a good old fashioned "Shit Swap" replied Jeff, his beedy pig-like eyes twinkling
"A shit swap?!!!?? I'll grab the plastic sheets and the laxative!!!!" exclaimed Brian, in a fake manly voice.