Etymology

buttinsky

butt·in·sky
B3U1T1T1I1N1S1K5Y4

Today it means: One who is prone to butt in, interrupt, or get involved where they are not welcome; a busybody. Full definition →

First used early 20th c.
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The story

From butt in (“to join a conversation or situation in which one is not welcome or invited, interject”) + -sky (a variant of -ski (suffix added to a word, name, or phrase to invoke Russianness, Polishness, or a more general Slavicness)), humorously modelled after Russian surnames, and originally and often used in the form of a surname.

First known use, by meaning

  • from early 20th c. One who is prone to butt in, interrupt, or get involved where they are not welcome; a busybody.

Etymology from Wiktionary, CC BY-SA 4.0.