Bryan McMahon was a teacher and writer from Listowel , Co Kerry. He did a lot of work with Traveller kids. Maybe he wrote something about this? Lots of words in Caint/Shelta are Irish words that have been shuffled around like anagrams. Thus ‘buachaill’ becomes ‘bloke’. ‘Cailin is ‘lackeeen’ etc. Thnaks for all your ideas!