Green’s Dictionary of Slang

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

1955		E. Hoagland Cat Man 117: ‘Are you snowing me? [...] If it was all that good, all that dough, you’d be there, buddy. Don’t feed me snow’.
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.’.