self-stimulation

From self- +‎ stimulation. Autism-related sense common since around 1970, before which other terms were also used.

self-stimulation (uncountable)

1. (psychology, autism) Repetitive behavior intended to stimulate one's senses.

   Synonym: stimming

2. (psychology, euphemistic, rare) Masturbation.
   • 1967, Sexual Self-Stimulation‎^[1]:

     [see title]

• stim, stimming, self-stim
• stereotypy