Kvetch — To complain, whine or fret, as in “He likes to kvetch at me when we serve kasha varniskes, because he doesn’t like it.”
Mensch (mentsch)— Literally “man,” an honorable, decent, stand-up person, as in, “I don’t care who you marry, as long as he’s a mensch.”
Meshuggeneh — Crazy, ridiculous, insane, as in, “He must be meshuggeneh to think he can wear that getup to a funeral.” (A related word is mishegoss, or craziness.)
Mishpocheh (mishpokhe, mishpucha)— Family, or someone who is “like family”
Nosh — To eat or nibble, as in “I’d like something to nosh on before dinner.” Can also be used as a noun to mean any kind of food.
Oy vey—An expression of woe, as in “Oy vey, we left the gefilte fish at the grocery store!”