Literally, it means Smelling the Breeze (Zephyr). In general, it's Spring Day in
Every year, the oriental church defines it on any Monday since the beginning of April till the beginning of May according to the Coptic calendar. However, Muslim Egyptians celebrate it like Christians exactly, because it's also an ancient Egyptian feast since the days of pharaohs.
The breakfast is colored boiled eggs and the lunch is smoked or salted fish or sardine & green onion. As Christians don't eat fish during their Lent (55 days) & finish their great fasting on the day before that day or Easter.