Green’s Dictionary of Slang

snow job n.1

also snowfall
[snow v. + job n.2 (2)/job n.2 (1b)]

(US) an untrue but totally convincing story, a con-man’s patter.

[US]B. Appel Plunder (2005) 218: I had to give Franny a snow job about you owing me two thousand pesos.
[US]A.S. Fleischman Venetian Blonde (2006) 173: Maggie could lay down a snow job like the blizzard of ’88.
[Can]R. Caron Go-Boy! 73: I laid a bogus snow job on them about having met the guy in a pool room.
[US]J. Ellroy Brown’s Requiem 63: They just know how to hand out a good snow job.
[US]R. Campbell In La-La Land We Trust (1999) 73: ‘What’s your suspicion?’ ‘Only that there’s been a snowfall.’ ‘To cover just exactly what?’.
[UK]Observer Screen 12 Sept. 14: Parker prided himself on his skills as a con artist and used a string of ‘snow jobs’ to pull the wool over the eyes of the people with whom he did business.
[US]Mad mag. Aug. 38: Dubya’s ‘Social Security is going bust’ snowjob.
[US]J. Ellroy Widespread Panic 285: ‘I need a favor’ [...] ‘Snow job alert. I sense one coming’.

In compounds

snowjob artist (n.)

one who sets out to deceive.

[US](con. 1950) E. Frankel Band of Brothers 71: You’ve been had, Justus. The biggest snow-job artist in the first Mar Div, and you’ve been had.