The Collaborative International Dictionary of English v.0.48:

Flunky \Flun"ky\ (fl[u^][ng]"k[y^]), n.; pl. Flunkies
   (fl[u^][ng]"k[i^]z). [Prob. fr. or akin to flank.] [Written
   also flunkey.]
   1. A contemptuous name for a liveried servant or a footman.
      [1913 Webster]

   2. One who is obsequious or cringing; a snob.
      [1913 Webster]

   3. One easily deceived in buying stocks; an inexperienced and
      unwary jobber. [Cant, U.S.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

flunkey
    n 1: a male servant (especially a footman) [syn: lackey,
         flunky, flunkey]
    2: a person of unquestioning obedience [syn: flunky,
       flunkey, stooge, yes-man]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "flunkey":
   apple-polisher, doormat, footman, gofer, hanger-on, hireling,
   inferior, jackal, lackey, lickspittle, menial, minion, retainer,
   servant, slave, stooge, subordinate, sycophant, toady, underling,
   yes-man