A language that allows one to easily customize syntax, flow control structures, etc. for the convenience of the author without regard to future readers. It allows one to create their own language or sub-language in their mind's own image without worrying about other readers' preferences or grokkability of the style. Contrast with a CorporateLanguage that assumes or targets masses of mediocre PlugCompatibleInterchangeableEngineers (programmers) where there may be many readers with varying skills. Such a language tends to hard-wire ways of things to reduce variation. One can say that a CorporateLanguage is for the herd of sheep while a HackerLanguage is for the lone wolf. ("Hacker" could be "hobbyist" or "tinkerer" also in this context. It's not meant to only include the devious version of "hacker".)One can often achieve high personal productivity with a HackerLanguage, but readability may fit a very narrow audience or be questionable. Sometimes derogatorily called a WriteOnlyLanguage.