The Collaborative International Dictionary of English v.0.48:

Snot \Snot\, n. [AS. snot; akin to D. snot, LG. snotte, Dan.
   snot, and to E. snout. See Snout.]
   1. Mucus secreted in, or discharged from, the nose. [Low]
      [1913 Webster]

   2. A mean, insignificant fellow. [Low]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Snot \Snot\, v. t.
   To blow, wipe, or clear, as the nose.
   [1913 Webster]

WordNet (r) 3.0 (2006):

snot
    n 1: a person regarded as arrogant and annoying [syn: snob,
         prig, snot, snoot]
    2: nasal mucus

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "snot":
   bugger, carrion, chyle, colostrum, corruption, creep, crumb, cur,
   dandruff, decay, discharge, dog, excrement, filth, foul matter,
   furfur, gangrene, gleet, high-hat, humor, ichor, knave, lachryma,
   lactation, leukorrhea, louse, lowlife, lymph, matter, mess, milk,
   muck, mucor, mucus, obscenity, ordure, peccant humor, phlegm, pig,
   prick, puke, purulence, pus, putrid matter, rat, reptile, rheum,
   rogue, rot, saliva, sanies, scoundrel, scum, scurf, scuz,
   serous fluid, serum, shit, shithead, skunk, slime, smut, snake,
   snoot, sod, sordes, stinkard, stinker, suppuration, sweat, tear,
   teardrop, the whites, toad, turd, urine, wretch