Ubuntu is a Nguni Bantu term roughly translating to "human kindness." It is an idea from the Southern African region which means literally "human-ness", and is often translated as "humanity towards others", but is often used in a more philosophical sense to mean "the belief in a universal bond of sharing that connects all humanity".
Nguni as explained by PeopleGroups.org refers to a group of Bantu languages spoken in southeastern Africa, primarily in the coastal belt from Zululand to Ciskei in South Africa.
Included in the Nguni group are the Zulu, Xhosas, Swazis, and Ndebeles.
Learn more about Nguni people at the following sites:
Britannica.com
South African History Online
Check out The 50 Best Sports Media Catch Phrases of All-Time featured at Bleacher Report.