The Collaborative International Dictionary of English v.0.48:

Stocky \Stock"y\, a. [From Stock.]
   1. Short and thick; thick rather than tall or corpulent.
      --Addison.
      [1913 Webster]

            Stocky, twisted, hunchback stems.     --Mrs. H. H.
                                                  Jackson.
      [1913 Webster]

   2. Headstrong. [Prov. Eng.] --G. Eliot.
      [1913 Webster]

WordNet (r) 3.0 (2006):

stocky
    adj 1: having a short and solid form or stature; "a wrestler of
           compact build"; "he was tall and heavyset"; "stocky
           legs"; "a thickset young man" [syn: compact,
           heavyset, stocky, thick, thickset]

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "stocky":
   adipose, beefy, big-bellied, bloated, blocky, blowzy, bosomy,
   brawny, burly, buxom, chubby, chunky, corpulent, distended, dumpy,
   fat, fattish, fleshy, full, gross, heavyset, hefty, hippy,
   imposing, low-set, lumpish, lumpy, lusty, meaty, mesomorphic,
   obese, overweight, paunchy, plump, podgy, portly, potbellied,
   pudgy, puffy, pug, pugged, pursy, retrousse, roly-poly, rotund,
   short, snub-nosed, solid, squab, square, squat, squattish, squatty,
   stalwart, stout, strapping, stubbed, stubby, stumpy, sturdy,
   swollen, thick, thick-bodied, thickset, top-heavy, tubby,
   turned-up, well-fed