Bloody Puddle

British: The end result of girl-on-top sex while menstruating; most often collecting in the man's navel, but occasionally on his scrotum. Known for its distinct reddish hue and delightful sloshing sound. It has been know to merge with existing duck butter or ass gravy to create decorative sheet paintings for the entire family to enjoy!

"Peppa, don't bother Daddy Pig! He's busy splashing around in the bloody puddle Mommy Pig left on his tummy!"