At Jewish weddings a glass wrapped in cloth is placed on the ground under the chuppah (bridal canopy) near the end of the official ceremony. Then one of the couple stomps on it, and all the congregation shouts "mazal tov!" with great joy.Similar to Jewish wedding where they smash glasses?
mazl tov!
It means good luck, or at weddings good luck or good wishes and congratulations.
One of the most interesting weddings I ever attended was where the groom was Jewish and the bride was Mongolian. They had two ceremonies, one Jewish with a choopah and rabbi and afterwards a ethnic Mongolian ceremony with a Mongolian shaman/priest.
The reception and the after party were very interesting and all the foods were very unique also.