Not a lot of easy surface details, but it seems like the language is pidgin Spanish adapted to whistling phonemes. There are a few videos where you can hear exa

Not a lot of easy surface details, but it seems like the language is pidgin Spanish adapted to whistling phonemes. There are a few videos where you can hear examples words like "Mexico" and so on. A little experimentation and I found I can whistle quite a few English words, so it's probably a matter of acclimation to vocabulary limits and practice among enough individuals that things become standardized. Using things unique to whistling could augment vocabulary or add nuance, but I don't see any reason straight US English (or other languages) couldn't be used. I could be way off base, but this is a pretty cool language format.