The Collaborative International Dictionary of English v.0.48:

Huffy \Huff"y\, a.
   1. Puffed up; as, huffy bread.
      [1913 Webster]

   2. Characterized by arrogance or petulance; easily offended.
      [1913 Webster]

WordNet (r) 3.0 (2006):

huffy
    adj 1: quick to take offense [syn: huffy, thin-skinned,
           feisty, touchy]
    2: roused to anger; "stayed huffy a good while"- Mark Twain;
       "she gets mad when you wake her up so early"; "mad at his
       friend"; "sore over a remark" [syn: huffy, mad, sore]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "huffy":
   aggravated, annoyed, arrogant, bearish, bitchy, cankered,
   cantankerous, cavalier, churlish, crabbed, cranky, cross,
   cross-grained, crusty, cussed, disagreeable, disdainful,
   exasperated, excitable, feisty, fractious, haughty,
   high-and-mighty, huffish, insolent, irascible, irritable,
   irritated, mean, miffed, nettled, ornery, overbearing, peeved,
   perverse, piqued, provoked, put-out, snappish, spiteful, spleeny,
   splenetic, supercilious, superior, testy, ugly, vexed, waspish