Green’s Dictionary of Slang

shotty n.

also shottie
[abbr.]

(orig. US black) a shotgun.

[[US]Salt Lake Trib. (UT) 5 Aug. 6/7: We send for shells for the shotty-gun every 10 days or so].
[US]Lerner et al. Dict. of Today’s Words 158: Shottie – a shotgun.
[Aus]M.B. ‘Chopper’ Read How to Shoot Friends 193: When I was told that Sid had been shot, I naturally suspected the .410 shotty had been used.
[US]W. Shaw Westsiders 42: He had his own rap name: R. Shottie — a ‘shottie’ is a shotgun.
[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 166/2: shotty n. a firearm.
[NZ] McGill Reed Dict. of N.Z. Sl.
[Aus]P. Temple Truth 364: Murray raised the shotgun barrel [...] ‘Scare you, this shotty?’.
[Aus] G. Johnstone ‘No Through Road’ in Crime Factory: Hard Labour [ebook] Duy racked the shotty.
[Aus]D. Whish-Wilson Zero at the Bone [ebook] Sawn-off shottie at present arms.
thewire.co.uk Oct. 🌐 There are many terms for guns [in grime music], for instance, usually single syllable words that can be dropped quickly: heat, skeng, shotty, pumpy, glock, gat, and so on.
[Aus]C. Hammer Scrublands [ebook] ‘He’s dead. Topped himself [...] Blew his brains out with a shotty’.
[Aus]D. Whish-Wilson Shore Leave 194: ‘Got his pistol, and a shottie’.
[US]T. Pluck Boy from County Hell 43: He dangled a cut-down pump shotty from his right index finger.
[Aus]D. Whish-Wilson I Am Already Dead 257: ‘[T]he whole armoury – the shotties, the pistolas, semiauto rifles, you name it’.

In compounds

bruck back shotty (n.)

(UK Black/gang) a sawn-off shotgun, thus bruck back, to saw off a gun.

Harlem Spartans ‘Call me a Spartan’ 🎵 And I'll bruck back the shotty shotty / The .45 or the 2's).
Tizzy Gang ‘How Comes’ 🎵 See me on the frontline, moving like Kuwaiti / With a big bruck back shotty and a 380.