Context Menu (Right Click) keyboard shortcut in Mac OS X

After doing extensive research on this topic, I can confirm that there is no built-in mechanism that enables context menu either by direct shortcut or right mouse click simulation. This is due to technical limitations of the operating system, which prevents from determining coordinates of the current selection (e.g., selected element).

Fortunately, in some applications it is possible to use Apple Script to facilitate such action, but this is a strictly application-specific approach.

While the contextual activation is lacking, in OS X you can activate and access the top menu bar using the keyboard, which will give you access to all of the commands in the contextual menu, and more

http://www.cnet.com/news/access-menus-via-the-keyboard-in-os-x/