"Schmaltz" is actually a german word for fat that one might spread on bread. It's not used very often. The adjective form 'schmaltzy' is slightly more common. A good synonym would be maudlin (look that one up). "I didn't like that movie - it was a tear-jerker . . . too schmaltzy for me."

This word is very old. Nobody uses it anymore. The only reason I know it is from an obscure song lyric. You don't need this word.