What does 3idkom mean in English?

"3idkom" is a transliteration of the Arabic word "عيدكم مبارك" (pronounced "Eidkum Mubarak"). It means "Happy Eid" in English.

Eid is a Muslim holiday celebrated at the end of Ramadan, a month of fasting and prayer. It is a time of celebration, family gatherings, and feasting.