Top Definition
When a group of three or more people get together on a sunday for an messy sexual experience. First everyone takes excessive amounts of laxatives then waits for the laxatives to work and everyone then takes turns having anal sex with each other and switching partners while the diarhea explodes out everywhere.
Jack: "Hey Will, are you coming over for slippery shooting sunday"
Will: "no man i had too help clean off your couch last week and i couldnt take a normal poop for four days"
by Sexualweekdays September 02, 2011

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