How to bind a key to disconnect from a server?

The title says it all. I would like to know how (if its possible) to bind a key so that when I press it I automatically leave from the SERVER I am on, like a rage quit key. Thank You!

I know you can just open console and type:
You can always unlock the console on Steam/TeknoMW3

Not always, sometimes, people hide the console from their server.

But yeah.
It would be nice to have a key absolutely un-used (Like numpad "5").
And when you need to, you press it and you're disconnected from the server.
Without obviously using the console.

Do you think it's possible people?