The Collaborative International Dictionary of English v.0.48:

Peppery \Pep"per*y\, a.
   1. Of or pertaining to pepper; having the qualities of
      pepper; hot; pungent.
      [1913 Webster]

   2. Fig.: Hot-tempered; passionate; choleric.
      [1913 Webster]

WordNet (r) 3.0 (2006):

peppery
    adj 1: having the piquant burning taste of peppers; "corn chips
           with peppery salsa"

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "peppery":
   alert, beany, brisk, burning, choleric, combustible, cranky, cross,
   curried, explosive, fiery, hasty, high-seasoned, high-spirited,
   hot, hot as pepper, hot-tempered, hotheaded, keen, lively,
   mettlesome, nippy, passionate, peppy, piquant, poignant, quick,
   quick-tempered, racy, ratty, seasoned, short-tempered, snappy,
   spiced, spicy, spunky, tangy, volcanic, with a kick, zestful,
   zesty, zippy