self-abuse

Short definition from Wiktionary

Noun

1. 1
   Self-deception.
2. 2
   Physical or verbal maltreatment of oneself.
3. 3
   Physical or verbal maltreatment of oneself: Injury inflicted deliberately upon oneself, especially resulting from a mental disorder.
4. 4
   Masturbation, regarded as sinful or harmful.

Verb

1. 1
   To harm oneself.
2. 2
   To masturbate.