Learn English – What does “uber-word” mean in particular context (see body of question)

body shop:

Date: 1954
a shop where automotive bodies are made or repaired

See this article for "body shop" context:

From the sales floor to the body shop to the office there is a resounding feeling that this Ford dealership is a good place to work.
The man in the body shop pointed out that the air filter system overhead was something that Dean Green voluntarily installed for the welfare of the employees.

so... basically "the mechanic", the technician, the repairman.

Found a little history on the word. It is indeed Yiddish:

shprits
spurt, to squirt, to sprinkle ∙ (m.) שפּריץ

Neal Karlen in The Story of Yiddish: How a Mish-Mosh of Languages Saved the Jews, says the word took on new meanings within a community of young Jewish comedians (exemplified by Lenny Bruce) in New York in the 1940s:

Using Yiddish as a base, the young Jewish comics helped develop only the second art form indigenous to the United States: the shpritz, a.k.a. "Jewish jazz." (African-American jazz is often thought of as the only such legitimate claimant. Curiously, "jazz" is slang for ejaculate: shpritz is Yiddish for "spray." Talk amongst yourselves.)

Wikipedia has this description from Albert Goldman of Lenny Bruce "shpritzing" during a famous Carnegie Hall concert:

Lenny worshipped the gods of Spontaneity, Candor and Free Association. He fancied himself an oral jazzman. His ideal was to walk out there like Charlie Parker, take that mike in his hand like a horn and blow, blow, blow everything that came into his head just as it came into his head with nothing censored, nothing translated, nothing mediated, until he was pure mind, pure head sending out brainwaves like radio waves into the heads of every man and woman seated in that vast hall.

Because of the word's historical association with Jewish comedy, its use in the quote you found is quite appropriate and well-chosen—even if a bit esoteric.