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The act of taking a huge dump on a rag of some sort and then slapping it onto the face of someone that is sleeping.
(The Morning After the kansas mud flap occured)
Ramone: "Dude it smells like shit in here..."
Steve: "Maybe because I totally Kansas Mud-Flapped you last night while you were passed out piss drunk."
by Halifax Redthorn February 11, 2008