1. A mound of fecal matter with emits an odor that is not pleasent.
2. A slang reference to an item or person which refers to the subject being unusable, of shoddy construction, unwanted, unreliable, or unacceptable in some fashion.
a pile of shit, otherwise known as POS, can be used to describe a person, or pile of shit, that seems nice and smells nice, but in reality, you realize that they're just a big pile of shit, and only pretended to like you so they didn't have to go to the prom alone. Fucking POS.
A pile of shit that is steaming because it recently emerged from an anus. In other words, really shitty shit; Or in other words, something blatantly false, incredibly terrible, or both.
"What a steaming pile of shit," Tom said after sitting through Joe's story of how he banged three gorgeous women, won a Formula One race, and was awarded the Nobel Prize all in one day.