Normally slipper is used by the meaning of the footwear slipper. But it can also relate to "being a slipper", which means to obey almost everything you're asked to do. By other words you're extremely dutiful if you're a slipper.
"Robert is my slipper since he does everything I tell him to do."
"Oh, stop it! You don't have to be my slipper all the time! I can do my dishes on my own."
Before we started I saw him put the condom on. When we finished the condom was on the bed. I guess when he was hitting itfrom the back he slipped it off! What a Slipper!