Noun. From Hawaiian.
“Someone who speaks rapidly in order to get information across to someone else, whilst hiding the meaning from others due to the speed of their speech”
I have done this before, resulting usually in the recipient saying ‘Whaaaaaa?’ or ‘Slow down!’
Those who are multilingual occasionally switch languages in a similar way. Sometimes it’s done to create a sense of inclusion or to assist the recipient(s) with comprehension. More often than not, though, it’s a sociolinguistic method of excluding others.