the muscle that you contract to get the poopy out. used by mike myers in wayne's world. see example below.
wayne: "ass sphincter says what?"
noah: "....what?"
wayne: "a sphincter says what?"
noah: "........what?"
wayne: "exactly."
noah: "....what?"
wayne: "a sphincter says what?"
noah: "........what?"
wayne: "exactly."
by i look like napoleon July 11, 2006
Something people say to entice the other party in to saying "what." Thus, making them an ass sphincter
person #1: "Ass sphincter says what?"
Person #2: "what?!"
Person #1: "Ha ha, you are an ass
sphincter!!"
Person #2: "what?!"
Person #1: "Ha ha, you are an ass
sphincter!!"
by diceyj February 05, 2004