"After you with the deck watch," I said to the snotty who was using it.
1560s, "full of snot," from snot + -y (2). Meaning "impudent, curt, conceited" is from 1870. Related: Snottily; snottiness. Snotnose "upstart" is from 1941; snotty-nose "contemptible fellow" is from c.1600.
: He's just a snotnose kid
An importunate upstart; a neophyte, esp a knowing one: some snot-nose in New York (1941+)