Green’s Dictionary of Slang

(US) to flatter, to confuse; thus snow-jobbing n., the act of flattering or confusing; snowjobbed adj., flattered or confused.

1943		Army Times (US) 11 Sept. 3/4: ‘Snow-jobbing’ is the newest strictly GI term, to go with ‘dogface,’ ‘goldbrick’ and others. ‘Snow jobbing’ is getting off a smooth line, like talking yourself out of a hole, or managing to pull five bucks from a buddy, or talking the sergeant out of a term of KP duty. If you’ve made the five buck loan, after being told what a great guy you are, then you’ve been ‘snow jobbed’.
1957		Kerouac letter 8 Nov. in Charters II (1999) 81: Lucien doesnt like her ... I think because he cant snowjob her.
1971		E.E. Landy Underground Dict. (1972).
1999		J. Ellroy ‘My Life as a Creep’ in Destination: Morgue! (2004) 115: I met my PO once a month and snow-jobbed him.