Green’s Dictionary of Slang

1. filth, lit. nasal mucus.

1598		Marston Scourge of Villanie I iii: O what dry braine melts not sharp mustard rime, To purge the snottery of our slimie time?
1601		Jonson Poetaster V iii: Teach thy Incubus to Poëtize, / And throwe abroad thy spurious Snotteries.

2. in fig. use, snobbery.

2001

Eve. Herald (Dublin) 17 Feb. 11/3: I can’t see the people of Sheriff Street re-enacting the Playboy riots because this temple to out moded snottery is moved souhwards.