World Drop (WoW)  

World drop is a term to describe an item that may 'drop' from killing a random monster in the world. Those items are usually very rare and can yield some good gold if sold to the proper people. Trying to purposefully get a world drop is a long and frustrating exercise, the best option is usually to comb the House (WoW) in hope of finding someone who's selling one.

World of Warcraft Wikibase™ Dictionary