Here are a few fun swahili words I found while in Africa:
Dakwakusutha: one who gets rude when he's full of drink
Songololo: centipede, or "the slow one"
Gilingwe: one who swallows up leopards, or "the fearless one"
Gobandlovu: one who bends elephants, or "the strong one"
Mabhongendlini: one who bellows like a bull in the house
Magwazephinda: one who is not satisfied with just a single achievement
Nhlekabayeni: one who laughs at a bride groom's party, or "one who laughs at anything