1. rude slang A derisive term for something that one considers utterly worthless or inferior. What do I want this piece of crap for? It's a table with two and a half legs! This computer my brother gave me is a total piece of crap. It barely even runs!

2. rude slang A derisive term for someone whom one considers contemptible or deplorable. Only a real piece of crap would treat someone like that. You piece of crap! You take that back or I'll smash your face in!