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Adjective: snot-nosed
Usage: informal
  1. Overly conceited or arrogant; showing or characterized by a superior, disdainful, or haughty attitude
    "The snot-nosed intern acted like he knew more than the senior staff";
    - bigheaded, snooty [informal], snotty [informal], stuck-up [informal], too big for one's breeches [informal], uppish [informal], pernickety [Brit, informal], snobbish
     
  2. Dirty with nasal discharge
    "a house full of snot-nosed kids";
    - snotty [informal]

See also: dirty, proud, soiled, toffee-nosed [Brit, informal], unclean