I have absolutely no idea what tu shay means. Could you perhaps be referring to the French word touche’? If so then touche’ is used in fencing when one player scores a hit. As a slang term it is also used to acknowledge when one has proven another wrong. Ironically, as an example, it would now be appropriate for you to tell me ‘Touche’, you are correct, I did mean the word touche’ and not tu shay’!