barker, n.² — Green’s Dictionary of Slang

barker n.²

[a ref. to the once popular song ‘Oh vare and oh vare is my leedle vee dog/Oh vare, oh vare is he gone?’]

a sausage.

1921		N&Q 12 Ser. IX 424: Barkers. Sausages.
1925		(con. WWI) Fraser & Gibbons Soldier and Sailor Words 17: Barker, A: [...] Also a sausage, with reference, of course, to the ancient joke embalmed in the once popular Dutchman’s song, ‘Oh vare, and oh vare, is my leedle vee dog?’.
1941		D. Burley N.Y. Amsterdam News 10 May 11: Some cat [...] might broom by and knock ’em to some fine dried barkers.