jellybean

noun

1. a small, bean-shaped, usually brightly colored candy with a hard sugar coating and a firm gelatinous filling.

noun

1. a bean-shaped sweet with a brightly coloured coating around a gelatinous filling

n.

1905, from jelly (n.) + bean (n.). So called for its shape. Soon used in U.S. slang for “stupid person,” probably encouraged by the slang sense of bean as “head.”