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