Code Jazz

Definitions

Code written with a lot of improvisation, flow, and stylistic freedom, sometimes elegant and sometimes impossible for others to follow. In engineering slang, code jazz can sound like praise when the performer is great and like criticism when maintainability suffers.
In plain English: Improvised, free-form coding that may be elegant or hard to follow.
Example: "The parser was pure code jazz, brilliant in motion but hard for anyone else to modify without breaking the rhythm."