It wasn’t the words that were odd, but the SOUNDS of the words. I swear they weren’t even pronouncing English words.
It's called, "Tyke."
Unique accents also typically have unique vocabulary.
The majority of the cast in the TV series Game of Thrones were using (faux) Tyke accents, despite the fact they're on an imaginary planet where there is no Yorkshire. This was to cover for the fact that actor Sean Bean (who was king of the joint when the series opened) is so thoroughly Yorkshire that he can't any other accent.