Code Volcano
Noun · Slang & Abbreviations
Definitions
A system or module with pressure building under the surface that may erupt dramatically once triggered. In engineering slang, code volcano implies long quiet periods that hide real accumulated danger.
In plain English: A seemingly quiet code area with built-up pressure that can erupt badly.
Example: "The legacy scheduler was a code volcano, calm for months at a time and then suddenly erupting when one rare calendar edge case hit production."