Lemon
Noun · Slang & Abbreviations
Definitions
Something fundamentally defective or disappointingly poor in quality despite expectations. In engineering slang, calling a system a lemon means the problems feel structural, not just accidental.
In plain English: Something defective or poor quality at a fundamental level.
Example: "The new appliance looked polished, but after the third firmware issue the team started calling it a lemon and planning replacement paths."