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"