When, while taking a dump, one allows a turd to partially leave the ass, and then pulls it back into and out of their asshole repeatedly. Also called "shit fucking".
Rob: "What took you so long in the bathroom?"
Steve: "I was giving myself a Slippery Steve."
Rob: "That's.... terrible."
Steve: "I was giving myself a Slippery Steve."
Rob: "That's.... terrible."
by salvatore iii November 27, 2008
Someone who cannot be trusted and will often do things behind somebodies back, generally an absolute twat.
by JTowers July 28, 2010