Yiddish: God should visit upon him the best of the ten plagues.

SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh.  See all Ten Plagues of Egypt.

‏‏גאָט זאָל אױף אים אָנשיקן פֿון די צען מכּות די בעסטע.

Got zol af im onshikn fun di tsen makes di beste.

God should visit upon him the best of the ten plagues.