WordNet (r) 3.0 (2006):

zing
    n 1: a brief high-pitched buzzing or humming sound; "the zing of
         the passing bullet"
    2: the activeness of an energetic personality [syn: dynamism,
       pizzazz, pizzaz, oomph, zing]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "zing":
   aggressiveness, animation, ardor, ball the jack, bang, barrel,
   boom, bowl along, breeze, breeze along, brio, brush, clip,
   cut along, dash, drive, elan, enterprise, enthusiasm, esprit, fire,
   fleet, flit, fly, fly low, foot, get-up-and-go, ginger, go fast,
   highball, initiative, kick, life, make knots, nip, oomph,
   outstrip the wind, pep, pepper, piss and vinegar, pizzazz, poop,
   pour it on, punch, push, rip, scorch, sizzle, skim, snap, speed,
   spunk, starch, storm along, sweep, tear, tear along, thrust,
   thunder along, verve, vim, whisk, whiz, zip, zoom