Mega Drop-Down Navigation Menu
I got the idea for this pattern from Jakob Nielsen's Alertbox article. According to the article, "Mega drop-down navigation menus" work better than regular drop-downs.
Read the article here: http://www.useit.com/alertbox/mega-dropdown-menus.html
The name is a bit misleading. How about “Fat flyout navigation menu” instead? ;)
Adminjannel (Admin, Patternry) commented
Yep, that's it, I'm glad someone else have "patternized" it already.
Sounds a lot like http://designinginterfaces.com/patterns/fat-menus/ to me ...