Weiner poopy refers to anal sex and or sex of any kind, also it refers to a female specimen shitting on a couch or floor after anal sex.

when you fuck a girl in the ass and she did't wipe very well, you get a poopie weiner.

A chili dog. It can have mustard, mayonaise, ketchup, and many other toppings. Mustard is urine. Ketchup is blood. Mayonaise is man jelly. Chili is poopie. The hotdog is the weiner. The bun is the sammich.