1. [n]  unacceptable behavior (especially ludicrously false statements); "I put up with a lot of bullshit from that jerk"; "what he said was mostly bull"
2. [n]  (biology) decaying caused by bacterial or fungal action
3. [n]  decay usually accompanied by an offensive odor
4. [v]  waste away; "Political prisoners are wasting away in many prisons all over the world"
5. [v]  break down; "The bodies decomposed in the heat"

Rot
In this four-character novel, an old man who is dying of cancer tries to make the most of his last days.

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1. \Rot\, v. i. [imp. & p. p. {Rotted}; p. pr. & vb. n.
   {Rotting}.] [OE. rotien, AS. rotian; akin to D. rotten, Prov.
   G. rotten, OHG. rozz?n, G. r["o]sten to steep flax, Icel.
   rotna to rot, Sw. ruttna, Dan. raadne, Icel. rottin rotten.
   [root]117. Cf. {Ret}, {Rotten}.]
   1. To undergo a process common to organic substances by which
      they lose the cohesion of their parts and pass through
      certain chemical changes, giving off usually in some
      stages of the process more or less offensive odors; to
      become decomposed by a natural process; to putrefy; to
      decay.
            Fixed like a plant on his peculiar spot, To draw
            nutrition, propagate, and rot.        --Pope.
   2. Figuratively: To perish slowly; to decay; to die; to
      become corrupt.
            Four of the sufferers were left to rot in irons.
                                                  --Macaulay.
            Rot, poor bachelor, in your club.     --Thackeray.
   Syn: To putrefy; corrupt; decay; spoil.
   

2. \Rot\, v. t.
   1. To make putrid; to cause to be wholly or partially
      decomposed by natural processes; as, to rot vegetable
      fiber.
   2. To expose, as flax, to a process of maceration, etc., for
      the purpose of separating the fiber; to ret.
   

3. \Rot\, n.
   1. Process of rotting; decay; putrefaction.
   2. (Bot.) A disease or decay in fruits, leaves, or wood,
      supposed to be caused by minute fungi. See {Bitter rot},
      {Black rot}, etc., below.
   3. [Cf. G. rotz glanders.] A fatal distemper which attacks
      sheep and sometimes other animals. It is due to the
      presence of a parasitic worm in the liver or gall bladder.
      See 1st {Fluke}, 2.
            His cattle must of rot and murrain die. --Milton.
   {Bitter rot} (Bot.), a disease of apples, caused by the
      fungus {Gl[ae]osporium fructigenum}. --F. L. Scribner.
   {Black rot} (Bot.), a disease of grapevines, attacking the
      leaves and fruit, caused by the fungus {L[ae]stadia
      Bidwellii}. --F. L. Scribner.
   {Dry rot} (Bot.) See under {Dry}.
   {Grinder's rot} (Med.) See under {Grinder}.
   {Potato rot}. (Bot.) See under {Potato}.
   {White rot} (Bot.), a disease of grapes, first appearing in
      whitish pustules on the fruit, caused by the fungus
      {Coniothyrium diplodiella}. --F. L. Scribner.