after heavy snow falls on top of a car roof, once the car picks up momentum, dollop of snow falls of the back of the car onto the road looking like the car has just pooed.
After the dollop drops from the back of the car, pointing at the dollop in the road "SNOW POO!"
This is a sex toy, created by defficating into a condom, then placing it into a freezer until fully frozen. The condom is then removed from the frozen faeces and the object is used as a dildo by the sexually adventurous.
"Darling, that snow poo you froze earlier might be ready to use now!"