Context summary: A man (him) falls into a hole , other men try to bring him out of it, before Eng (the Chinese man who lives in the hole) comes back.A bit of context might make this intelligible. Who is "him"? Where is he being hauled from? Who is "Eng" and what is "his hole"?
This fits with your context-driven idea of "piece of shit."d-horn
Describing someone who is a dumbass. A substitute for the word "D-bag" [Edit = douche-bag]
"Yeah I had that teacher, he was a D horn"