What is "huk!"

Huk! is a 1956 American action film directed by John Barnwell and written by Stirling Silliphant filmed in the Philippines.. The film stars George Montgomery, Mona Freeman, John Baer, James Bell, Teddy Benavides and Mario Barri. The film was released on August 9, 1956, by United Artists. It is the first Philippine film of George Montgomery who would return to the islands in the 1960s to produce, direct, co-write and star in a number of Philippine films.