While considering the massive amount of effort that goes into creating a believable fantasy language, I had to recall where I heard the first one.
I do believe the first time I was conscious of one would be the book and then the movie, “A Clockwork Orange”.
“There was me, that is Alex, and my three droogs, that is Pete, Georgie, and Dim, and we sat in the Korova Milkbar trying to make up our rassoodocks what to do with the evening. The Korova milkbar sold milk-plus, milk plus vellocet or synthemesc or drencrom, which is what we were drinking. This would sharpen you up and make you ready for a bit of the old ultra-violence.”
What fantasy tongue first caught your attention?