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לאנדסמאן - Landsman
In Yiddish, the word "Nebish" means an awkward person, or nerd.
The Yiddish word for a clumsy awkward person is "shlemazel." It is often used to describe someone who is unlucky or accident-prone.
Yiddish = Yiddish (ייִדיש)
Crook (as in criminal) = Farbrecher (פאַרברעכער)
In person, most Yiddish speakers, religious or not, will greet with the familiar "Shalom Aleichem". Hopefully, another contributor will improve this answer, and add the telephone greeting.
The Yiddish word for funny is "קומיש."
The Yiddish word for disappointed is "bafel."
The Yiddish word for swindler is "gonif".
The Yiddish word for colored is "farblondzhet."
There is no Yiddish word that refers to a circumcised person. You would just say "a Man mit a Milah" (א מאן מיט א מילה), which means "a man with a circumcision"