Tashildler can be said as "Tashildler, Shu (fourth tone)". "Tashi Dele" is a Tibetan language, and you will hear such words when you go to Tibetan areas. "Tashi" means good luck, and "having fun" means good. It means that the Tibetan people welcome and wish good luck. Translation together means good luck. When communicating with Tibetan friends in Tibetan areas, if the other person says "Tashi is happy", which can be translated as "Welcome" or "Good luck", then you can reply "Tashi is happy, Shu (the fourth tone)" instead of exactly the same "Tashi is happy".