A type of bowel movement in which the "bio-product" consists ONLY of chicken, noodles, and other ingredients of chicken noodle soup passed through the stool due to chicken noodle soup being the only meal-type consumed for the same number of days that it takes for the host's body to digest the first consumed bowl of chicken noodle soup.
This could be the case as a result of a bad cold or the flu leading to the consumption of only chicken noodle soup in hopes of miraculous relief.
A poopnoodle is what happens when you pee right after fucking someone hard in the ass. Poop gets stuck up in the dick hole and comes out in the form of a noodle when you piss.
I spent last night pluggin' my lover's bottom like the BP oil well and when I went to the bathroom afterwards, I ended up squirting out a poopnoodle when I took a piss.