The Collaborative International Dictionary of English v.0.48:

Stack \Stack\, v. t. [imp. & p. p. Stacked (st[a^]kt); p. pr.
   & vb. n. Stacking.] [Cf. Sw. stacka, Dan. stakke. See
   Stack, n.]
   1. To lay in a conical or other pile; to make into a large
      pile; as, to stack hay, cornstalks, or grain; to stack or
      place wood.
      [1913 Webster]

   2. Specifically: To place in a vertical arrangement so that
      each item in a pile is resting on top of another item in
      the pile, except for the bottom item; as, to stack the
      papers neatly on the desk; to stack the bricks.
      [PJC]

   3. To select or arrange dishonestly so as to achieve an
      unfair advantage; as, to stack a deck of cards; to stack a
      jury with persons prejudiced against the defendant.
      [PJC]

   To stack arms (Mil.), to set up a number of muskets or
      rifles together, with the bayonets crossing one another,
      and forming a sort of conical pile.
      [1913 Webster]

WordNet (r) 3.0 (2006):

stacked
    adj 1: arranged in a stack
    2: (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:

89 Moby Thesaurus words for "stacked":
   Junoesque, accumulated, agglomerate, aggregate, agreeable, amassed,
   amply endowed, assembled, becoming, bonny, braw, built,
   built for comfort, bunched, bundled, buxom, callipygian,
   callipygous, clumped, clustered, collected, combined, comely,
   conglomerate, congregate, congregated, cooked-up, cumulate,
   curvaceous, curvesome, curvilinear, curvy, cut out, cut-and-dried,
   cut-and-dry, fair, fascicled, fasciculated, fixed, gathered,
   glomerate, goddess-like, good-looking, goodly, heaped, in session,
   in the bag, joined, joint, knotted, leagued, likely,
   lovely to behold, lumped, massed, meeting, on ice, packaged,
   packed, personable, piled, planned, pleasing, plotted, pneumatic,
   prearranged, preconcerted, precontrived, premeditated, preordered,
   presentable, put-up, rigged, rounded, schemed, set-up, shapely,
   sightly, slender, statuesque, well-built, well-developed,
   well-favored, well-formed, well-made, well-proportioned,
   well-shaped, well-stacked, wrapped up