∙ To stimulate oneself sexually, especially by use of one’s hand, sometimes with a partner. intransitive
∙ To stimulate someone else sexually without penetration of the penis. transitive, colloquial
∙ To stimulate or please oneself by means of anything, not necessarily sexual, that does not get them anywhere; something that wastes their time; something that does not help others or achieve any important goal. informal, derogatory