It has words for nearly every personality type known to humankind.
It's hilarious and I will probably break out some of the sayings at my Passover Seder in the spring. --Joan Rivers Yiddish is a wonderful, rich, descriptive, often onomatopoetic language.
Words such as shlep, shmata, nosh are regularly used in film, on TV and in books and magazines, without translation. Inflection, too, is an important aspect to Yiddish.
The addition of a rhyme beginning with "shm" to denote something of little consequence ("Hospital, shmospital... This from Leo Rosten's wonderful book "The Joys of Yiddish": (The questioner as asking whether he/she should attend a concert being given by a niece.
"r" is gently rolled, as the single "r" in Spanish or French.