Koalang is a term coined by Janusz A. Zajdel, a Polish science fiction writer. It is a language used by people in a totalitarian world called Paradyzja in his 1984 novel of the same name. The "ko-al" in "koalang" derives from the Polish words 'kojarzeniowo-aluzyjny' ("associative-allusive").
Because Paradyzja is a space station, and activity is tracked by automatic cameras and analysed, mostly, by computers, its people created an Aesopian language, which is full of metaphors that are impossible for computers to grasp. The meaning of every sentence depended on the context. For example, "I dreamt about blue angels last night" means "I was visited by the police last night."
The software that analyzes sentences is self-learning. Thus, a phrase that is used to describe something metaphorically should not be used again in the same context.