Green’s Dictionary of Slang

snotnose n.

[snot n.1 + SE nose]
(orig. US)

1. an arrogant, snobbish person.

[US]E. Dahlberg Bottom Dogs 228: Dan was tormenting the life out of Sarah and calling her a little sunday school snotnose.
[US]J. Weidman What’s In It For Me? 94: You put these little snotnoses out on the leash for a while.
[US](con. 1900s) G. Swarthout Shootist 128: You cheap snotnose.
[US]P. Munro Sl. U. 176: That sixteen-year-old with the Jag is probably a real snotnose.
[SA]J. Naidoo Coolie Location 142: Ag, leave this snotnose here and let’s high-tail it there on our own!
[SA]K. Cage Gayle 95/2: snot nose queen n. pretentious gay man.

2. a small child with a running nose, a grubby child; also in fig. use.

[US]H. Roth Call It Sleep (1977) 220: Snott nuzz! Oll – balt a frosk.
[US]S. Bellow Augie March (1996) 184: I’ve known you since you both was snot-noses.
[US](con. c.1900) J. Thompson King Blood (1989) 22: Brat! Snotnose!
[US]S. King Christine 112: You stay out of my way from now on, you goddam snotnose.

3. (also snot, snothole) a young, inexperienced person.

Psyche & Eros I 70: It is not unusual for his father to say to him, a man of forty-one: ‘You are a snot-nose! You don't understand anything!’.
[US]J. Conroy World to Win 82: It’s all the same, you little snot-nose.
[US]W.L. Gresham Nightmare Alley (1947) 38: I’d beat the be-Jesus out of any snotnose that went monkeying around Molly.
[US]S. Bellow Augie March (1996) 101: Beat it, you little jag-offs [...] Damn snots, where’s your upbringing!
[US]E. Hunter Blackboard Jungle 286: A snotnose barely out of college had in effect told Small to shut up.
[US]A. James America’s Homosexual Underground 79: Little snot nose blows up a storm.
[US]C. Bukowski Erections, Ejaculations etc. 97: ‘Robinson!’ the other snot-nose hollered.
[US]S. King It (1987) 212: Bet them little snotholes back there saw him.
[UK]J. Mowry Way Past Cool 42: I could get this done [...] for a goddam dime bag of rock if I want some other little snot to do it!