What is "pieces of crap"

Usage examples of "pieces of crap".

Now some might complain that the trench broom lacked penetrating power, but he was positive he could see pieces of crap flying out of the Henschel's motor.

I drove the van across the bridge until I was out of sight of Basco, parked it on the shoulder and slogged down to the riverside under the bridge, carrying half my weight in various pieces of crap.