The Collaborative International Dictionary of English v.0.48:

Flirt \Flirt\, v. t. [imp. & p. p. Flirted; p. pr. & vb. n.
   Flirting.] [Cf. AS. fleard trifle, folly, fleardian to
   trifle.]
   1. To throw with a jerk or quick effort; to fling suddenly;
      as, they flirt water in each other's faces; he flirted a
      glove, or a handkerchief.
      [1913 Webster]

   2. To toss or throw about; to move playfully to and fro; as,
      to flirt a fan.
      [1913 Webster]

   3. To jeer at; to treat with contempt; to mock. [Obs.]
      [1913 Webster]

            I am ashamed; I am scorned; I am flirted. --Beau. &
                                                  Fl.
      [1913 Webster]

WordNet (r) 3.0 (2006):

flirting
    n 1: playful behavior intended to arouse sexual interest [syn:
         flirt, flirting, flirtation, coquetry, dalliance,
         toying]