Chakobsa is a fictional language used by the Fremen people of the Dune universe created by Frank Herbert. In the series of novels which begins with Dune, the language is said to be based on another fictional language, the Bhotani Jib (likely derived from Bhutan and referring to a dialect derived from there). Herbert took the name from Chakobsa, the "hunting language" of the Caucasus, an anglicized form of Adyghe.
Examples of the language from the books are actually a mixture of the Romani language, from a Gypsy magic textbook Herbert used for reference, one sentence in Serbo-Croatian, and various Arabic terms, with definitions altered slightly to suggest the passage of time.
The non-canon Dune Encyclopedia (1984) by Willis E. McNelly includes extensive descriptions of the Fremen language. The Encyclopedia was approved by Herbert but rendered erroneous in some areas through Herbert's later works in the Dune series.
The 2003 Sci Fi Channel TV miniseries Frank Herbert's Children of Dune includes a song by Brian Tyler entitled "Inama Nushif", which is claimed to contain lyrics sung in Fremen. According to miniseries director Greg Yaitanes, Tyler claimed that he "searched through Herbert's books and deciphered enough of the fictional Fremen language to write this powerful song." However, in reality the song is an alteration of a speech by Muad'dib published in The Dune Encyclopedia, expanded with some repetitions, and a different 'translation' attached to it. The original text's first lines are "Innama nishuf".
An example of Chakobsa is seen in the ancient funeral ritual of the Fremen in which the water of a dead tribesman is magically blessed: "Ekkeri-akairi, fillissin-follas. Kivi a-kavi, nakalas! Nakalas! Ukair-an ... jan, jan, jan ... .
(Translation "This is the water of (the new owner). Never the more to be measured or counted by the heartbeats of (the old owner). Go, go, go...")