He crossed his legs and said in a condescending tone, 'Bwana, bring me a glass of water.'

Bwana 是斯瓦希里语借词，原意为"主人"或"先生"，在非洲英语中常被用作对白人殖民者或上级的尊称。在这个语境下带有讽刺意味，暗示说话者以居高临下的态度称呼对方。