Source : Webster's Revised Unabridged Dictionary (1913)

Hog \Hog\, v. i. (Naut.)
   To become bent upward in the middle, like a hog's back; --
   said of a ship broken or strained so as to have this form.

Hog \Hog\, n. [Prob. akin to E. hack to cut, and meaning orig.,
   a castrated boar; cf. also W. hwch swine, sow, Armor. houc'h,
   hoc'h. Cf. {Haggis}, {Hogget}, and {Hoggerel}.]
   1. (Zo["o]l.) A quadruped of the genus {Sus}, and allied
      genera of {Suid[ae]}; esp., the domesticated varieties of
      {S. scrofa}, kept for their fat and meat, called,
      respectively, {lard} and {pork}; swine; porker;
      specifically, a castrated boar; a barrow.

   Note: The domestic hogs of Siam, China, and parts of Southern
         Europe, are thought to have been derived from {Sus
         Indicus}.

   2. A mean, filthy, or gluttonous fellow. [Low.]

   3. A young sheep that has not been shorn. [Eng.]

   4. (Naut.) A rough, flat scrubbing broom for scrubbing a
      ship's bottom under water. --Totten.

   5. (Paper Manuf.) A device for mixing and stirring the pulp
      of which paper is made.

   {Bush hog}, {Ground hog}, etc.. See under {Bush}, {Ground},
      etc.

   {Hog caterpillar} (Zo["o]l.), the larva of the green
      grapevine sphinx; -- so called because the head and first
      three segments are much smaller than those behind them, so
      as to make a resemblance to a hog's snout. See {Hawk
      moth}.

   {Hog cholera}, an epidemic contagious fever of swine,
      attended by liquid, fetid, diarrhea, and by the appearance
      on the skin and mucous membrane of spots and patches of a
      scarlet, purple, or black color. It is fatal in from one
      to six days, or ends in a slow, uncertain recovery. --Law
      (Farmer's Veter. Adviser.)

   {Hog deer} (Zo["o]l.), the axis deer.

   {Hog gum} (Bot.), West Indian tree ({Symphonia globulifera}),
      yielding an aromatic gum.

   {Hog of wool}, the trade name for the fleece or wool of sheep
      of the second year.

   {Hog peanut} (Bot.), a kind of earth pea.

   {Hog plum} (Bot.), a tropical tree, of the genus {Spondias}
      ({S. lutea}), with fruit somewhat resembling plums, but
      chiefly eaten by hogs. It is found in the West Indies.

   {Hog's bean} (Bot.), the plant henbane.

   {Hog's bread}.(Bot.) See {Sow bread}.

   {Hog's fennel}. (Bot.) See under {Fennel}.

   {Mexican hog} (Zo["o]l.), the peccary.

   {Water hog}. (Zo["o]l.) See {Capybara}.

Hog \Hog\, v. t. [imp. & p. p. {Hogged}; p. pr. & vb. n.
   {Hogging}.]
   1. To cut short like bristles; as, to hog the mane of a
      horse. --Smart.

   2. (Naut.) To scrub with a hog, or scrubbing broom.

Source : WordNet®

hog
     n 1: a person regarded as greedy and pig-like [syn: {pig}]
     2: a sheep up to the age of one year; one yet to be sheared
        [syn: {hogget}, {hogg}]
     3: domestic swine [syn: {pig}, {grunter}, {squealer}, {Sus
        scrofa}]
     [also: {hogging}, {hogged}]

hog
     v : take greedily; take more than one's share
     [also: {hogging}, {hogged}]

Source : Free On-Line Dictionary of Computing

hog
     
        1. Favoured term to describe programs or hardware that seem to
        eat far more than their share of a system's resources,
        especially those which noticeably degrade interactive
        response.  *Not* used of programs that are simply extremely
        large or complex or that are merely painfully slow themselves
        (see {pig, run like a}).  More often than not encountered in
        qualified forms, e.g. "memory hog", "core hog", "hog the
        processor", "hog the disk".  "A controller that never gives up
        the I/O bus gets killed after the bus-hog timer expires."
     
        2. Also said of *people* who use more than their fair share of
        resources (particularly disk, where it seems that 10% of the
        people use 90% of the disk, no matter how big the disk is or
        how many people use it).  Of course, once disk hogs fill up
        one file system, they typically find some other new one to
        infect, claiming to the sysadmin that they have an important
        new project to complete.