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1.
1. The act of being alone in a chatroom talking to oneself.

2. The act of posting random thoughts in a chatroom without responding to others, nor addressing the topics discussed.
In a public act of chatsturbation, Jim posted his thoughts on Armageddon in a NASCAR fans chatroom.
by PJ Ork July 27, 2008
 
2.
The act of fervently or nonchalantly masturbating while on any video chat website
Man 1: Do you still look for hot girls on the Omegle video chat?

Man 2: Nah, not anymore. Too much chatsturbation.
by daddyspankee April 29, 2011