bobkes
I'm assuming it's "bob-kus". This means "nothing".
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kibitz
This means to meddle.
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kvetch
I think the k is silent. This means to annoy or an annoying person; to complain.
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mishigas/mishegoss
Pronounced "mish-gos" with a long o like in long. This means crazy/craziness, bizarre actions or beliefs.
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nosh
This means to snack.
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nuchslep
Pronounced "nu-sh-lep". But Yiddish is derived somewhat from German so the "ch" is the sound when your throat is tickly. There's a video to go with it. This means a tag-a-long, a pathetic loser who lives off of other people's lives.
[the actual word is pronounced in episode 4 part 2]
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OY
You've probably heard this word before, and it's an exclamation of sorrow or lamentation.
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pisk
This means big mouth.
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plotz
This means to burst or explode [in any emotion]. This is said exactly how it sounds "plotsss"
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schmageggy/shmegegge
Pronounced "schma-ga (like in gag) ge (like gee)", and this means a sissy of a guy, or a petty, untalented person.
One of my personal favorites.
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shmeer
Pronounced "schmeer". and it means to spread (butter on bread).
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schmootz/shmuz
Pronounced "sch-mutz" and it means dirt.
"you've got some shmuz on your face."
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schlep/shlep
Pronounced "schlep" and it means to drag around.
"I can't believe I have to schlep you around town to look for those earrings".
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schmuck
Pronounced exactly how it sounds and it means a detestable person.
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tuches/tokhes
Pronounced "tok-hus" with a stressed throat sound (think of what the German language is famous for) for the kh.
This is one of my favorites.
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yenta
This means a busybody, usually an older woman.
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OnMyList
List your pants off!