"Mashallah" or "Mash'Allah" is an Arabic phrase used to show appreciation for a person or happening. It shows respect, and also reminds that everything is achieved by the will of God. The closest English translation is "God willed it." It is used to show joy and praise, and is evoked upon hearing good news.
The phrase has found its way into the language of non-Arabs, including Turks and peoples of the Balkans, including some who are not of the Islamic faith.
Mashalla or Mashallah, an Arabic word used to show appreciation to something or someone. It's usually used to the same context as using the word "wow" in English. However the literal meaning is "what God has willed" and it's usually not what's meant by when mentioned in a sentence.