Ooga booga is a phrase used to mock or mimic the way that a foreign language sounds. The history of this phrase is unknown, and like many pieces of English slang, it is probably without a locus classicus, instead being a spontaneous projection of the collective unconscious.
While the phrase "ooga booga" is mostly used in a light-hearted manner, and can be used to ironically mock xenophobia, careless use of it may come off as quite racist. Therefore, be careful who you say "I can't understand your Ooga Booga language" to.