'The term refers to the pact that Ulysses made with his men as they approached the Sirens. Ulysses wanted to hear the Sirens' song, although he knew that doing so would render him incapable of rational thought. He put wax in his men's ears so that they could not hear and had them tie him to the mast so that he could not jump into the sea. He ordered them not to change course under any circumstances, and to keep their swords upon him to attack him if he should break free of his bonds.
Upon hearing the Sirens' song, Ulysses was driven temporarily insane and struggled with all of his might to break free so that he might join the Sirens, which would have meant his death.'
When an individual takes Step Three, it is wise to enter into such a pact. What this means is that you are committing in advance to continuing, in perpetuity, to take every action suggested in the Big Book ('Alcoholics Anonymous') and by your sponsor regardless of how may feel or what you may think about such actions in the future. You are also authorising sponsors and friends to pull rank on you if you stray, supplant your perception of your situation and best interests with theirs, and direct your actions.