This is the day when you clean the
litterbox. If more than one
person lives in the
abode, they generally
take turns changing the
kitty litter. It can be an
unpleasant experience; that's why they make
littermaid and other
self-cleaning literboxes.
Cats are such amazingly clean animals, they never smell bad (unless they are sick) and clean themselves voraciously. It's kind of ironic that their shit smells so damn bad...