Jabulani is the name that was given to the official ball of the 2010 FIFA World Cup. As I indicated in the title of this post, the word jabulani means "to celebrate" in one of South Africa's most widely spoken native languages, Zulu.
Incidentally, this ball was also the cause of a lot of controversy during the World Cup as many football players claimed that it was too light and hence frequently behaved differently to what they were accustom to. Fortunately for us we had nothing to do with the making of the ball as I understand the making was coordinated between FIFA and Adidas. Phew! :)