yumba-yumba [yumba-yúmbà] n 1Dolphin; Porpoise (as of the sea dwelling mammal). lumba-lúmbà (sem. domains: 1.6.1.6 - Shark, ray.) 2Dolphin!; Fat person (colloquial). (sem. domains: 2.1 - Body, 1.6.1 - Types of animals.)