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1. slang Arrogant and snobbish. I was already bored, but now that we have a snot-nosed tour guide, I'm leaving. Did you hear how judgmental he was about our choice of wine? What a snot-nosed jerk.
2. slang Young and inexperienced. I've been in this job 20 years, and now some snot-nosed kid right out of college is going to tell me what to do? No way!