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."