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CMD+OPTION+W, but it only works per application.
Or you could hide all other applications (including windows) via CMD+OPTION+H.
 
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I think the only way to accomplish that would be any of the following:

Logout
Restart
Shutdown

I'm sure that's not the answer you were quite looking for, but I don't think there is any other way.
 
CMD+SHIFT+W, but it only works per application.
Or you could hide all other applications (including windows) via CMD+OPTION+H.

its option+cmd+W and option+cmd+H, however that only closes and hides, the OP is maybe looking to quit all.

you could press cmd+tab and then while holding cmd press Q. or Google an Automator service/action or Apple Script that will quit all open apps.
 
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