because Friday to arab Muslims is like Sunday to Christian; so Juma MUBARAKA IS good or blessed friday.

It means "Blessed Friday" and friday is blessed day for muslims when they go to the masjid, and they listen to a lecture, and make a special prayer on that day.

jumma mubarak meaning This day has its own importance in Islamic religion and history. So, knowing about this day is important, that’s why we bring this detailed article for you who will help you to understand the true meaning of Jumma Mubarak, https://jummamubarak.info

it's like you say happy week end ==jumu3a(Friday)mubaraka(blessed)

it means blessed Friday