Turning off or disabling chat in gmail is as easy as clicking the link to turn off the chat. 
But, to permanently disable it, you must add some entries in your hosts file to block the ips leading to the gmail chat. Like shown below:
127.0.0.1 chatenabled.mail.google.com
127.0.0.1 talkgadget.google.com
127.0.0.1 hostedtalkgadget.google.com
127.0.0.1 talk.google.com
127.0.0.1 talkx.l.google.com
Then restart your computer and you are good to go.
If you like this post, leave a comment.



