The Collaborative International Dictionary of English v.0.48:

bootlicking \bootlicking\ adj.
   attempting to win favor from influential people by flattery.

   Syn: fawning, obsequious, sycophantic, toadyish, ass-kissing.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

bootlicking
    adj 1: attempting to win favor from influential people by
           flattery [syn: bootlicking, fawning, obsequious,
           sycophantic, toadyish]
    2: attempting to win favor by flattery [syn: bootlicking,
       fawning, sycophantic, toadyish]