Green’s Dictionary of Slang

butt v.

[butt n.1 (2b)]
[1940s–50s] (US)

1. to pass someone a cigarette.

2. to crush out a cigarette.

SE in slang uses

In phrases

butt around (v.)

[1910s] (US) to socialize.

butt in

see separate entries.

butt out (v.) [SE butt v.]

1. [20C+] (W.I., Guyn.) to ignore, to cut dead, to pass by rudely.

2. see also separate entry.

In exclamations

butt out!

see separate entry.