Green’s Dictionary of Slang

1. (orig. US) one who intrudes or interferes; also as v., to interfere.

1901		Chicago Sun. Trib. 17 Nov. humor section n.p.: ‘I observe that you are a member of the Buttinski family’.
1902		T.A. Dorgan in Zwilling TAD Lex. (1993) 23: That noble butterinsky who hangs around the billiard table and tells you what to do.
1905		‘Hugh McHugh’ You Can Search Me 54: Sixteen editors, fourteen reporters and twenty-three linotype men would take a running kick at old Buttinski.
1906		Sun (NY) 9 Sept. 3/2: Some buttinski that’d married a rich skirt listening to [...] his dad-in-law.
1913		J. London Valley of the Moon (1914) 61: ‘So you’re the buttinsky, eh?’ he demanded, his face malignant with passion.
1914		Tacoma Times (WA) 12 May 4/1: Carranza and Villa didn’t instantly turn their task over to the South American ‘buttinskis’.
1920		Logan Republican (UT) 24 Jan. 6/1: Very few editors know how to run their papers [...] All towns would be better if they had a few more buttinskys on the job.
1926		J. Doone Timely Tips For New Australians 16: BUTTINSKI.—A slang word frequently used to describe an inquisitive person.
1938		X. Herbert Capricornia (1939) 445: Woffall you come buttinski?
1947		S. Lewis Kingsblood Royal (2001) 185: I’d like to hang every buttinsky that helps any nigger to go to college.
1952		M. Millar Vanish in an Instant (2016) 104: ‘You’re a butterinski, Victor’.
1953		S. Bellow Augie March (1996) 221: Shut up! [...] C—sucker! I asked him, not you, budinski!
1955		B. Schulberg On the Waterfront (1964) 44: Buttinsky, you keep outa this.
1960		Wodehouse Jeeves in the Offing 40: It is never pleasant for a man of sensibility to find himself regarded as a buttinski.
1961		‘Duncan Lee’ Castro Assassinated (2009) 157: That buttinsky, Fenton, had to foul things up.
1975		T. Berger Sneaky People (1980) 94: He assailed the buttinsky. ‘Goddam, you stupid twerp!’.
1983		J. Ciardi A Second Browser’s Dict. 37: Buttinski. [...] A little help I could use; a Mr. Nosy Buttinski I got no need for.
1989		H. Rawson Dict. of Invective (1991) 225: The intruder who does all these nasty things is, naturally, a kibitzer, i.e., a buttinkski.
1999		J. Stahl Perv (2001) 36: It’s Betadine, you buttinski. I gotta swab you down.
2003		McGill Reed Dict. of N.Z. Sl. 41: buttinski To interrupt or butt in, from WWI soldiers. ANZ.
2009		B.K. Holway When Jack was With Us 64: You’re a buttinski and a weisenheimer mitt no life of your own, a troublemaker, a bigmouth!
2012		E. Toth Ms. Mentor’s Impeccable Advice for Women in Academia 100: If you become a buttinski, you'll do nothing but make enemies.

2. attrib. use of sense 1.

1902		Ade Girl Proposition 70: The friend belonged to the Buttinksy Family and refused to stay on the Far Side of the Room.
1911		S. Ford Torchy 58: Sure, I hadn’t been called to play any Buttinsky part.
1927		(con. 1900s) S. Lewis Elmer Gantry 67: The way she’d get rid of that buttinsky aunt of Nell’s.
1996		J. Byrell Lairs, Urgers & Coat-Tuggers 149: Now, simply because it is none other than Big Oscar [...] who is behaving in such a buttinsky manner, we all [...] zip our yaps.