Someone calling your shit poop is them saying, "Man, you're full of shit."
When you are being hypocritical someone can rightfully call your shit poop.
Scott: "Hey Blue, you surfing the net at work again?"
Bill: "Hey Scott, weren't you just on HotOrNot.com again?"
Katie: "Damn. Bill just called your shit poop."
an alternate way of saying; fuck, damnit, shit, shit balls, mutherfucker, tits, tits and bagels, and oh no.
"hey dude, my mom found my our weed in my room"
"aww poop shit ass, how much trouble did you get in"
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while bowling you drop your 16 lb bowling ball on your foot
"POOP SHIT ASS!!!!!!!!!!!!''