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1.
Much like the blankets held out by firemen to catch people jumping out of buildings on fire, a shit blanket is there to help catch the shit falling out of your ring of fire (butt hole), and reduce the effect of splashback.

This is done by throwing a few sheets of paper down to lay on the surface of the water. Some people like to take this too far, and instead put half the roll of paper down the toilet turning the shit blanket into more of a shit cushion.
Leroy: "Hey Bob, I've taught myself to shit before I piss so the splashback isn't so bad."

Bob: "Well gee Leroy, you could have just put down a shit blanket first."

Leroy: "I'm saving tree's yo."
by panda4king January 02, 2011