OK, if you insist on talking about gross stuff, we also say:
Mám žízeň, že bych vypil mrtvýmu oko = I am so thirsty I would drink a dead man's eye.
Correct me if I'm wrong but I think that's called cannibalism.
Or possibly scavenging (a new English word for me). Maybe necrophagia (more understandable... to understand the meaning not the behaviour).