yeah, that had me wondering too, so i googled it

and just so you don't have to:

User Posted Link

Word: Mashallah
Meaning: Literally means 'Whatever Allah (God) wills'. It is often used in occasions where there is surprise in someones' good deeds or achievements. For example people say Mashallah when someone does very well in their exams.

Posted By: Ralf Scrampton, Oct 28, 12:37:14