Also known as "creampie", a curd is a contraction of cum and turd; such as the residual from anal sex.
WARNING: Curds can make a time-delayed exit, usually when trying to sneak a fart later. Pass with caution!
When I decided I was through with her ass, Mary went and relinquished her curds in the toilet.
alt.; Little Miss Muffet, sat on her tuffet...