Do 5D/6D movies/cinemas really exist?

A friend of mine was like 'hey, I went to 6D cinema' and I was like 'You kidding me? There is not such a thing as a 6d cinema'. I know maybe I'm not that updated about these stuff, but I do know that there are 3d and some 4d theaters out there. What about 5d and 6d?
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