“Klugscheißer”?

Question

Does Japanese have a term more-or-less equivalent to the German Klugscheißer (literally, "clever-shitter"; in English: smartypants, smartass, know-it-all, etc.)?

(Needless to say, this is not a term suitable for polite conversation!)

The best I could do was to look for translations for "smartass" or "smartypants". All I got this way was 賢い人, which, AFAIK, is not considered particularly vulgar, and does not even carry the derogatory/mocking overtones of the Klugscheißer. (But please correct me if I'm wrong!)

P.S. If you found an online source for this translation, please include it in your answer! I had no success with the many I tried, including a short video entirely devoted to equivalents in various languages (but not in Japanese).

Answer 1

I think that there is no equivalent of the German Klugsche*ßer in Japanese.

The only word that comes to mind is しつこい, which can be used in a similar situation as Klugsche*ßer, e.g.

Du bist echt 'n Klugsche*ßer! (You old smarty-pants)
しつこい!

where here しつこい is used to indicate that the person has given information beyond the limit, possibly to expound on his extensive knowledge about the subject.

But this is a very loose translation and しつこい applies in many more situations than Klugsche*ßer, like the dictionary entry would suggest:

しつこい (adj-i)

1. insistent/obstinate/persistent/tenacious
2. too rich (taste, etc.)/fatty/heavy/greasy

Answer 2

In French, this has two meanings. Both conveys that the person is irritating but one is "clever for real", one is "pretending to be".

For the "pretending to be clever", you have 知ったかぶり.