As a curiosity, in the novel "The name of the rose" by Umberto Eco the character Salvatore is so described (Day 1st, VIth hour, my translation):
"I cannot say now, and I never understood in those times, which kind of language he spoke. It was not Latin, used by the literate men of the abbey, nor the vulgar of those lands, nor any other vulgar I ever heard. [...] When I later learned about his eventful life and all the places he had lived in, without finding roots anywhere, I understood he spoke every language, and none. That is to say, he invented for himself his own language, using fragments of the languages he had come in contact with."
Needless to say, I'm not proposing this as a viable explanation for the VMS!
"I cannot say now, and I never understood in those times, which kind of language he spoke. It was not Latin, used by the literate men of the abbey, nor the vulgar of those lands, nor any other vulgar I ever heard. [...] When I later learned about his eventful life and all the places he had lived in, without finding roots anywhere, I understood he spoke every language, and none. That is to say, he invented for himself his own language, using fragments of the languages he had come in contact with."
Needless to say, I'm not proposing this as a viable explanation for the VMS!