Noun

1. A virtual sexual encounter in which two or more persons connected remotely via a computer network send one another sexually explicit messages describing a sexual experience.

   He went to his office and logged online to have cybersex for more than six hours. In the shadows of the net: 2001. Hazelden Foundation P65.

Verb

1. To exchange explicit sexual experiences online via text or multimedia.
2. To engage in sexual activity, usually masturbation, while communicating online with another person.