Definition of self-stimulation in US English:

self-stimulation

noun

  • 1The stimulation of one's own genitals for sexual pleasure; masturbation.

  • 2Behavior consisting of repetitive actions or movements of a type that may be displayed by people with developmental disorders, most typically autistic spectrum disorders.

    ‘they interpreted the restless and inattentive behavior of ADHD children as self-stimulation’
  • 3Physiology
    A phenomenon that occurs in the hypothalamus and other areas of the brain, in which the propagation of electrical stimulation has positive reinforcing properties that act to maintain and perpetuate the impulses.