boba UK /ˈbəʊ.bə/US /ˈboʊ.bə/ noun3 •(informal, slang) A breast, especially that of an adult or adolescent female human. •Ellipsis of boba tea.“I was shocked,” said Leanne Yuen, a longtime boba drinker and a student at the University of California, Irvine. “What am I going to do now?” — 2021 •Synonym of tapioca pearl.She settled on the Chai Frappé Burst, a frozen, blended concoction with whipped cream, boba and cinnamon sugar sprinkles. — 2024 formsbobas