Source : Webster's Revised Unabridged Dictionary (1913)

Hooky \Hook"y\, n. [Written also {hookey}.] [Cf. {Hook}, v. t.,
   3.]
   A word used only in the expression to play hooky, to run
   away, to play truant.

         This talk about boys . . . playing ball, and ``hooky,''
         and marbles, was all moonshine.          --F. Hopkinson
                                                  Smith.

Hooky \Hook"y\, a.
   Full of hooks; pertaining to hooks.

Source : WordNet®

hooky
     n : failure to attend (especially school) [syn: {truancy}]