Resipoo

The residual dog crap that sticks to the bottom of your shoe that is almost impossible to get off.

After you step on dog poo and try to scrape as much of it off on the sidewalk and grass, there is always some left in the crevices of the tread in your shoe. That is the resipoo.

Don't get into my car until you've washed away all the resipoo on your shoe.