From Wiktionary, the free dictionary
Blend of chimpanzee + -ese.
Chimpanese
- (slang, humorous, rare) Language of, similar to, or resembling that of a chimpanzee.
- (slang, humorous, rare) Nonsense language; gibberish. (especially in reference to use by humans)
I don't speak French, but I can speak Chimpanese pretty well.