The Collaborative International Dictionary of English v.0.48:

Jag \Jag\, v. t.
   To carry, as a load; as, to jag hay, etc. [Prov. Eng. &
   Colloq. U.S.] JAG

The Collaborative International Dictionary of English v.0.48:

JAG \JAG\, JAG \J.A.G\, n. (Mil.)
   Same as Judge-Advocate General. [Acronym]
   [PJC] Jaganatha
   Jagannatha
   Jagannath

The Collaborative International Dictionary of English v.0.48:

Jag \Jag\ (j[a^]g), n. [Prob. of Celtic origin; cf. W. gag
   aperture, cleft, chink; akin to Ir. & Gael. gag.] [Written
   also jagg.]
   [1913 Webster]
   1. A notch; a cleft; a barb; a ragged or sharp protuberance;
      a denticulation.
      [1913 Webster]

            Arethuss arose . . .
            From rock and from jag.               --Shelley.
      [1913 Webster]

            Garments thus beset with long jags.   --Holland.
      [1913 Webster]

   2. A part broken off; a fragment. --Bp. Hacket.
      [1913 Webster]

   3. (Bot.) A cleft or division.
      [1913 Webster]

   4. A leather bag or wallet; pl., saddlebags. [Scot.]
      [Webster 1913 Suppl.]

   5. Enough liquor to make a man noticeably drunk; a small
      "load;" a time or case of drunkeness; -- esp. in phr. To
      have a jag on, to be drunk. [Slang, U. S. & Dial. Eng.]
      [Webster 1913 Suppl.]

   Jag bolt, a bolt with a nicked or barbed shank which
      resists retraction, as when leaded into stone.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jag \Jag\, v. t. [imp. & p. p. Jagged; p. pr. & vb. n.
   Jagging.]
   To cut into notches or teeth like those of a saw; to notch.
   [Written also jagg.]
   [1913 Webster]

   Jagging iron, a wheel with a zigzag or jagged edge for
      cutting cakes or pastry into ornamental figures.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jag \Jag\, n. [Scot. jag, jaug, a leather bag or wallet, a
   pocket. Cf. Jag a notch.]
   A small load, as of hay or grain in the straw, or of ore.
   [Prov. Eng. & Colloq. U.S.] [Written also jagg.] --Forby.
   [1913 Webster]

WordNet (r) 3.0 (2006):

jag
    n 1: a sharp projection on an edge or surface; "he clutched a
         jag of the rock"
    2: a slit in a garment that exposes material of a different
       color underneath; used in Renaissance clothing
    3: a flap along the edge of a garment; used in medieval clothing
       [syn: jag, dag]
    4: a bout of drinking or drug taking
    v 1: cut teeth into; make a jagged cutting edge

Moby Thesaurus II by Grady Ward, 1.0:

92 Moby Thesaurus words for "jag":
   Vandyke, bacchanal, bacchanalia, bacchanalian, bat, bear, bender,
   binge, blaze, booze, bout, buck, bum, bust, carousal, carouse,
   celebration, chop, cleft, cog, comb, compotation, convey, crag,
   crena, crenellate, crenulate, crimp, cut, debauch, depression,
   drinking bout, drunk, drunken carousal, fang, ferry, gash, guzzle,
   hack, harrow, hump, incise, incision, indent, indentation, jab,
   jog, joggle, kerf, knurl, lug, machicolate, mill, nick, nock,
   notch, orgy, pack, peak, pecten, picot, pink, potation, projection,
   pub-crawl, puncture, rake, ratchet, sawtooth, scallop, scarify,
   score, scotch, serrate, slash, snag, snaggle, soak, souse, spire,
   spree, sprocket, spur, stab, steeple, symposium, tear, toot, tooth,
   tote, transport, wassail