Sounds somewhat like a chicken clucking. Bacauk is the question which the mice in Douglas Adams' book The Hitchhiker's Guide to the Galaxy are looking for. They spent so much time trying to decode the question using humans, knowing the answer was 42, but alas! They would not listen to the chickens.
Untranslatable into any known language. It is said that whoever pronounces the word correctly will be entrusted with all knowledge of the universe.
(Note: not endorsed by Douglas Adams himself)