From a CNN article about the Celtics beating the Lakers last night:
It was a group effort by this gang in green, which bonded behind Rivers, who borrowed an African word ubuntu (pronounced Ooh-BOON-too) and roughly means ”I am, because we are” in English, as the Celtics’ unifying team motto.
The Celtics gave the Lakers a 12-minute crash course of ubuntu in the second quarter.
I looked it up:
Ubuntu is a sub-Saharan African ethic or humanist ideology focusing on people’s allegiances and relations with each other.