Green’s Dictionary of Slang

(orig. US) smooth talk, bluff, bluster, lies.

1956		W.A. Heflin US Air Force Dict.
1958		E. Gilbert Vice Trap 128: We’ve all been brainwashed by the snow he’s been shovelling.
1969		‘Iceberg Slim’ Pimp 31: I put the snow machine into high gear.
1972		G.V. Higgins Friends of Eddie Coyle 11: ‘Think we’ll have snow by then?’ ‘I think we’re gettting some right now.’.