You shouldn't call people a piece of shit. Bag of shit is way more creative.

I believe "shit dust" is my all time fav of the shit variety.

I have questions that are so disturbing that I will never ask them. Thanks for polluting my brain.

piece of fuck is my preference

I've been using "Bag of Dicks" a lot, lately.

My preference is still scumbag but Yak absolutely hates that term.

Whenever I feel really sick the phrase "I feel like 10lbs of shit in a 5lb bag" gets used a lot... so I'm on board with this shit bag, bag of shit concept.

A hangover is feeling like a bag of squashed assholes.

Bucket of smashed assholes may work too. When referring to people it could also be used as the plural.

burning bag of shit on the WH steps