Source : Webster's Revised Unabridged Dictionary (1913)

Self-abuse \Self`-abuse"\, n.
   1. The abuse of one's own self, powers, or faculties.

   2. Self-deception; delusion. [Obs.] --Shak.

   3. Masturbation; onanism; self-pollution.

Source : WordNet®

self-abuse
     n : manual stimulation of the genital organs (of yourself or
         another) for sexual pleasure [syn: {masturbation}, {onanism}]