The Collaborative International Dictionary of English v.0.48:

Waggish \Wag"gish\ (-g[i^]sh), a.
   1. Like a wag; mischievous in sport; roguish in merriment or
      good humor; frolicsome. "A company of waggish boys."
      --L'Estrange.
      [1913 Webster]

   2. Done, made, or laid in waggery or for sport; sportive;
      humorous; as, a waggish trick.
      [1913 Webster] -- Wag"gish*ly, adv. -- Wag"gish*ness,
      n.
      [1913 Webster]

WordNet (r) 3.0 (2006):

waggish
    adj 1: witty or joking; "Muskrat Castle as the house has been
           facetiously named by some waggish officer"- James
           Fenimore Cooper

Moby Thesaurus II by Grady Ward, 1.0:

42 Moby Thesaurus words for "waggish":
   antic, arch, capersome, comic, comical, devilish, droll, elfish,
   elvish, facetious, foolish, frolicsome, full of mischief, funny,
   gamesome, high-spirited, humorous, impish, jocose, jocular,
   knavish, laughable, ludicrous, mischief-loving, mischievous, pert,
   playful, prankish, pranksome, pranky, puckish, roguish, rompish,
   saucy, scampish, scapegrace, sportful, sportive, trickish, tricksy,
   tricky, witty