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Schmuck is supposedly an obscene Yiddish term for the male sex organ, yet it appears all of the time in the media as an American idiom for a jerk. Can one use it in polite company?

Compare schmuck. As a verb, "to have sex with," by 2005. Related: Schlonged; schlonging. It does have a verbal usage, but strangely it says it started to be used in 1969. The linked Ngram Viewer seems to support it. What is its etymology? How did it get its traction? Is the word shlong or sclung related with it? How vulgar is this word?

Etymonline.com gives a lot of definitions regarding an implement or instrument, specifically inanimate objects. But the word has crept into English slang in reference to people, as in "he is a to...