Green’s Dictionary of Slang

1. to leave; fig., to stop interfering; often as excl.

1904		Sydney Sportsman (Surry Hills, NSW) 28 Sept. 3/7: He saw a man butt out of the crowd and pass what he took to be his ticket to another man.
1911		S. Ford Torchy 92: ‘We’re intimate friends of the bride [...] but we’ve forgotten our tickets.’ ‘That’s good, but musty. Butt out, please.’.
1930		(con. 1900s–10s) Dos Passos 42nd Parallel in USA (1966) 322: He said it was about time for him to butt out.
1935		S. Kingsley Dead End Act I: Aw, Drina, will yuh butt outa dis?
1936		(con. 1920s) Dos Passos Big Money in USA (1966) 784: Charley guessed it was about time for him to butt out.
1959		B. Hecht Sensualists (1961) 57: Butt out, Junior.
1968		‘Sl. of Watts’ in Current Sl. III:2.
1969		J. Crumley One to Count Cadence (1987) 19: Butt out, Larkin.
1978		J. Webb Fields of Fire (1980) 185: Assholes here ain’t got any right to butt in. So butt the hell out!
1986		C. Hiaasen Tourist Season (1987) 376: They actually wanted to say thanks for butting out.
1996		J. Byrell Lairs, Urgers & Coat-Tuggers 149: [I]t looks as if the little urger is, indeed, going to tell Big Oscar to butt out.
1999		S. Grafton O is for Outlaw (2000) 305: I think I’ll butt out for now.
2000		P. Howard Miseducation of Ross O’Carroll-Kelly (2004) 72: Will you focking butt out?
2004		E. Weiner Drop Dead, My Lovely (2005) 188: You also had to tell her to shut up and butt out.
2007		S. Maloney Sucked In 210: In the meantime I should butt out and stop making promises.
2013		M. Pruett ‘Extras’ in ThugLit Nov.-Dec. [ebook] ‘We’ll make it quick. Butt out’.
2018		Sowetan Live 2 Mar. 🌐 This has nothing to do with them and they should butt out .

2. (W.I.) to emerge, to come out of a passage or hidden place.

1996

Allsopp Dict. Carib. Eng. Usage.