Koalang is a term invented by Janusz A. Zajdel, Polish science fiction writer. It was a language used by people in a totalitarian world called Paradyzja (in Zajdel's 1984 book by the same title, Paradyzja).

Because Paradyzja was a space station, where all activity was tracked by automatic cameras and analysed (mostly) by computers, people created a jargon full of metaphors, impossible for computers to grasp. The meaning of all sentences depended on context. For example, the phrase "Tonight I dreamt about blue angels" meant "The Police visited me tonight".