backslapper

from WordNet (r) 3.0 (2006)

backslapper
    n 1: someone who demonstrates enthusiastic or excessive
         cordiality

from Moby Thesaurus II by Grady Ward, 1.0

47 Moby Thesaurus words for "backslapper":
      adulator, apple-polisher, ass-licker, backscratcher, blarneyer,
      bootlick, bootlicker, brown-nose, brownie, cajoler, clawback,
      courtier, creature, cringer, dupe, fawner, flatterer, flunky,
      footlicker, groveler, handshaker, helot, instrument, jackal,
      kowtower, lackey, led captain, lickspit, lickspittle, mealymouth,
      minion, peon, puppet, serf, slave, spaniel, stooge, suck,
      sycophant, timeserver, toad, toady, tool, truckler, tufthunter,
      wheedler, yes-man