Eid Mubarak!

"Eid Mubarak!"

Definition: A phrase of greetings said among Muslims to congratulate each other on holidays. It literally means, "Blessed Festival!" The appropriate answer is, "Allah yubarak feek!" (May Allah bless it for you also!)

Eid refers to the occasion itself, and Mubarak is roughly 'may it become good for you', but the phrase is used in the same context that Merry Christmas would be.