red mouse
a used bloody tampon
My cat walked over and had what appeared to be a little red mouse in his mouth. I soon realized that he had simply been digging in the trash again. Dirty kitten.
wearing the red mouse
Being on the rag, having your period, menstruating wearing a tampon.
Baby, I know you want me, and I want you too, but I have to warn you before we get intimate because I am wearing the red mouse.