A language derived from German that is spoken by Jewish people all over the world. It literally translates as "Jewish" and is written in the Hebrew alphabet .
Howard either speaks or knows several words of the Yiddish language, such as "shiksa" (non-Jewish woman) or "kreplach" (filled dumplings). While Raj seems to know some words as well (such as kreplach), Sheldon does not (0207, 0302).
Raj: Hold on a second. Kreplach??
Raj: That isn't Klingon. It's yiddish for meat-filled dumpling!
Sheldon to Howard in The Jiminy Conjecture:
Raj: What happened?
Sheldon: Obviously another carnal fiasco with the 'Shiksee' goddess.
Howard: Shiksa. Shik-Sa.
Sheldon: Forgive me. Yiddish was not spoken in East Texas. And if it was, it wasn't spoken for long.