self-appointed

from WordNet (r) 3.0 (2006)

self-appointed
    adj 1: designated or chosen by yourself; "a self-appointed
           guardian of public morals"

from Moby Thesaurus II by Grady Ward, 1.0

20 Moby Thesaurus words for "self-appointed":
      assuming, busy, busybody, forward, impertinent, inquisitive,
      insolent, meddlesome, meddling, nosy, officious, overweening,
      presuming, presumptuous, prying, pushing, pushy, self-elect,
      snoopy, would-be