a good piece - a polite insult, like saying 'crap' but with more style and

a polite insult, like saying 'crap' but with more style and a little less Britishness

He called me a good piece, it was like being insulted with style.

She said I was a good piece, I took it as a compliment but it was still an insult.

They called me a good piece, I didn’t even know it was an insult at first.