I do not know the Mac equivalent of this
According to this: http://wow.gamepedia.com/Console, you can:
* Using the Terminal application (Mac)
* Open the Terminal application (usually found in /Applications/Utilities/Terminal.app)
* Type "open" followed by a space (do not press return)
* Drag the "World of Warcraft Launcher" application onto the flashing cursor in the Terminal window
* Type "--args -console" Your command line should now look something like this: open /Applications/World\ of\ Warcraft/World\ of\ Warcraft\ Launcher.app --args -console
* Press return
*The WoW launcher will open; press Play
* Once the login screen appears, press the "`" key (or whichever key you have bound to the console)
I just tried myself and it works