The Collaborative International Dictionary of English v.0.48:

Squirt \Squirt\ (skw[~e]rt), v. t. [imp. & p. p. Squirted; p.
   pr. & vb. n. Squirting.] [Cf. LG. swirtjen to squirt, OSw.
   sqv[aum]tta, E. squander.]
   To drive or eject in a stream out of a narrow pipe or
   orifice; as, to squirt water.
   [1913 Webster]

         The hard-featured miscreant coolly rolled his tobacco
         in his cheek, and squirted the juice into the fire
         grate.                                   --Sir W.
                                                  Scott.
   [1913 Webster]

   Squirting cucumber. (Bot.) See Ecballium.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Squirt \Squirt\, v. i.
   1. To be thrown out, or ejected, in a rapid stream, from a
      narrow orifice; -- said of liquids.
      [1913 Webster]

   2. Hence, to throw out or utter words rapidly; to prate.
      [Low] --L'Estrange.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Squirt \Squirt\, n.
   1. An instrument out of which a liquid is ejected in a small
      stream with force. --Young.
      [1913 Webster]

   2. A small, quick stream; a jet. --Bacon.
      [1913 Webster]

   3. (Hydrodynamics) The whole system of flow in the vicinity
      of a source.
      [Webster 1913 Suppl.]

   4. a youngster.
      [PJC]

   5. a short, overly assertive, or impudent person, especially
      when young; -- used in contempt.
      [PJC]

WordNet (r) 3.0 (2006):

squirt
    n 1: someone who is small and insignificant [syn: pip-squeak,
         squirt, small fry]
    2: the occurrence of a sudden discharge (as of liquid) [syn:
       jet, squirt, spurt, spirt]
    v 1: cause to come out in a squirt; "the boy squirted water at
         his little sister" [syn: squirt, force out, squeeze
         out, eject]
    2: wet with a spurt of liquid; "spurt the wall with water"

Moby Thesaurus II by Grady Ward, 1.0:

90 Moby Thesaurus words for "squirt":
   a nobody, a nothing, blow out, blowout, cast forth, cipher,
   common man, debouch, decant, discharge, disembogue, disgorge,
   disgorgement, dummy, dysentery, ejaculate, ejaculation, emission,
   eruct, eructation, erupt, eruption, exhaust, expel, expulsion,
   extravasate, extravasation, figurehead, flush, flux, font, fount,
   fountain, geyser, gush, insignificancy, jackstraw, jet,
   lightweight, little fellow, little guy, man of straw, mediocrity,
   nebbish, nobody one knows, nonentity, obscurity, outburst, outpour,
   pip-squeak, play, pour, pour forth, pour out, punk, pup, puppy,
   runs, runt, rush, scrub, send forth, send out, shits, shrimp,
   small fry, small potato, small potatoes, spatter, spew, spit,
   spout, spouter, sprat, spray, sprit, spritz, spurt, spurtle, squit,
   stream, surge, throw out, trots, vomit, vomit forth, vomit out,
   well, whiffet, whippersnapper