I have heard of 'Mother Tongue' which referes to a native languge so England may be English I guess as an example however I am not too sure, it could also refer to the language or even dialect from your mother.
Would be good to get an explanation
So for the people who came up with this idea perhaps their native language is gibberish
@zleap I think it has to do with some sort of gibberish born again Christians speak from a kind of trans.