When engaging in particularly rough anal sex, pull out and scrap all fecal matter/juice and coat the entire sack. You then turn and tea bag a waiting third party.
Jim: "Holy shit! Cassie and Sarah let me give them both the Mississippi Mud Sack last night!"
Steve: "You're my hero Jim!!!"
Steve: "You're my hero Jim!!!"
by Peppercornbingle April 16, 2009