Portmanteau of "gchat" and "advertise," when one writes a status message that all other friends on the gchat list read. Common method of disseminating too much information.
She likes to gchatvertise her status. Her status keeps changing on gchat five minutes ago it was, "I can't believe i got picked up for two minutes!" Three minutes ago her status was, "I baked cookies!" Two minutes ago the status was, "I feel fat". Now it is, "Leaky faucet." She really needs to stop gchatvertising her business