The white (hopefully) stuff that gathers around a woman's genitalia, and sometimes in her underpants (thong if you're lucky, granny panties if you're not). Often has the consistency of cottage cheese.
He began to regret the hours of foreplay beforehand when he caught a glimpse of the klitty litter in her panties.
Things women leave behind at another person's house ; whether intentionally or unintentionally. The leaving of any object may notify other women of her visitation or provide her with a reason to return. Examples of kitty litter: earrings, bobby pins, shoes, panties etc.
The discoloration, and possible presence of other unidentifiable putrid substances, left behind in a woman's underwear caused by poor pussy maintenance.
"I was going to go down on her, but when I took off her panties they were covered in kitty litter."