[1] : The Collaborative International Dictionary of English v.0.48

snack \snack\, n. see snatch, v. t.
   1. a share; a part or portion; -- obsolete, except in the
      colloquial phrase, to go snacks, i. e., to share.
      1913 webster

            at last he whispers, "do, and we go snacks." --pope.
      1913 webster

   2. a slight, hasty repast. colloq.
      1913 webster
see also:
snatch to go snacks 

[2] : WordNet (r) 2.0

snack
     n : a light informal meal syn: bite, collation
     v : eat a snack; eat lightly; "she never loses weight because
         she snacks between meals" syn: nosh
see also:
bite collation nosh 

[3] : Moby Thesaurus II by Grady Ward, 1.0

57 moby thesaurus words for "snack":
   bait, bit, bite, butt, chip, chunk, clip, clipping, collation,
   collop, crumb, cut, cutting, dollop, elevenses, end, fragment, gob,
   gobbet, hunk, light lunch, light meal, light repast, lump, modicum,
   moiety, morsel, nibble, nosh, paring, particle, peck, peck at,
   pick, pick at, piece, rasher, refreshment, refreshments, scoop,
   scrap, shard, shaving, shiver, shred, slice, sliver, smithereen,
   snatch, snip, snippet, splinter, spot of lunch, stitch, stump,
   tatter, tea

Snack >> S Words
Snack, definition of term: Snack
snack_pag1.html

Snack Bar >> S Words
Snack Bar, definition of term: Snack Bar
snack+bar_pag1.html