The Collaborative International Dictionary of English v.0.48:

bosomy \bos"om*y\ (b[oo^]z"[u^]m*[y^]), a.
   1. Characterized by recesses or sheltered hollows.
      [1913 Webster]

   2. Having a large bosom; -- of a woman.
      [PJC]

WordNet (r) 3.0 (2006):

bosomy
    adj 1: (of a woman's body) having a large bosom and pleasing
           curves; "Hollywood seems full of curvaceous blondes"; "a
           curvy young woman in a tight dress" [syn: bosomy,
           busty, buxom, curvaceous, curvy, full-bosomed,
           sonsie, sonsy, stacked, voluptuous, well-
           endowed]

Moby Thesaurus II by Grady Ward, 1.0:

73 Moby Thesaurus words for "bosomy":
   adipose, bagging, baggy, ballooning, beefy, bellying, big-bellied,
   billowing, billowy, bloated, blowzy, brawny, bulbose, bulbous,
   bulging, bumped, bumpy, bunched, bunchy, burly, buxom, chesty,
   chubby, chunky, corpulent, distended, dumpy, fat, fattish, fleshy,
   full, gross, heavyset, hefty, hillocky, hippy, hummocky, imposing,
   lusty, meaty, moutonnee, obese, overweight, paunchy, plump,
   pneumatic, podgy, portly, potbellied, pouching, pudgy, puffy,
   pursy, roly-poly, rotund, rounded, square, squat, squatty,
   stalwart, stocky, stout, strapping, swelling, swollen,
   thick-bodied, thickset, top-heavy, tubby, verrucated, verrucose,
   warty, well-fed