Client from Hell
Noun Phrase · Slang & Abbreviations
Definitions
A dramatic phrase for a customer, partner, or consuming system that is unusually difficult to work with. In engineering slang, it can refer either to a human relationship or to a badly behaved client implementation that breaks every assumption.
In plain English: A very difficult customer or badly behaved client system.
Example: "The mobile integration was the client from hell because it retried aggressively, ignored cache headers, and kept sending malformed payloads during peak load."