'Camnesia' is what occurs after one has done something on webcam one wishes he/she had not- especially beaver shots and self-violation.
Heather was totally claiming camnesia until Justin started posting webcaptures of her with her arm up her snatch. Then Heather just sort of...disappeared.
When you lose your chat history of previous conversations, and can't remember anything about someone you previously chatted with.
(Nick): Jennifer, right?
(Jennifer): I don't remember you, who are you?
(Nick): oh, sorry, I'm Nick
(Jennifer): Sorry, I've lost my chat history, I don't remember you, I have chatnesia