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The Yiddish slang term for thieves is "gonifs."
The Yiddish slang term for "uncle" is "tante" (pronounced "tanta"). However, it is important to note that this is a slang term and not the formal Yiddish word for uncle, which is "onkel."
The Yiddish slang term for riches is "gelt." It is often used to refer to money or wealth in a colloquial way.
A fin (short for "finnif") is slang for a five-dollar bill. It is derived from the Yiddish word for "five" ("finf").
Fapping is a slang term for masturbation. The sound a male produces when he masterbates is where the term comes from.
An older term you may still hear is "pal" or "best buddy." In British slang, they have used "bestie." You may also see the term BFF (best friend forever). Sometimes, "homie" or "homeboy" is used in urban slang, referring to a friend who comes from your neighborhood. (In Yiddish slang, this is also used-- "Landsman" carries the meaning of someone you are familiar with, because they are from the old country or from your ethnic group.)
yesteryear Yiddish (his first language) Yid (a slang term for a Jewish person)
The Yiddish term for a backhanded insult is "a shpatzir in di eigene kehile." It translates to "a walk in one's own community," implying a subtle insult disguised as a casual comment.
The Yiddish term for friend is "פֿרייַנד" (friend).
In Yiddish, Shayna means "beautiful" or "pretty." It is commonly used as a term of endearment or to describe someone who is attractive.
One derogatory slang term for a sailor who never goes to sea is a "dockwalker." This term is used to imply that the sailor does not actively participate in sailing or go on voyages.
The Yiddish word "piska" does not have a widely recognized meaning. It is possible that it may be a variation or misspelling of another Yiddish word, or a slang term specific to a particular region or community. It is always best to consult native Yiddish speakers or Yiddish dictionaries for accurate definitions of specific words.