Jumma Mubarak literally means
Happy Friday, where Jumma means "Friday" and Mubarak translates as "blessed". Muslims offer weekly prayers on Friday noon which is sacred to their religion and considered holy day
according to Islamic beliefs.
so every Friday is a holiday for Muslims, and they celebrate it by forgiving each others and pray together in the masjid, and also love each others,
also Muslims before used to invite all of the men they know at the masjid to drink a coffee or a tea or anything at someone's house.
so Muslims meets in the Masjid every Friday to see each others, and also if someone is missing and didn't come to the masjid they notice so they call him and see if
everything is OK.
Ahmed: Jumu'ah Mubarakah
Mohammed, i enjoyed the Jummaa pray.
Mohammed: Jumu'ah Mubarakah on us and you, yeah I enjoyed the pray too!.