Dirty bathtub

When you ejeculate, and all the semen lands in your belly button. Meaning you must scoop out the semen from your belly button.

"Yo man I had a wank yesterday, and I managed to get a dirty bathtub"

Pink Panther Shit

Having a shit while completely naked

(Origins From a meme)

“Man That Taco Bell had my stomach so bad, I had to resort to the dreaded... pink panther shit”