From Latin 'uber' (udder/breast) — literally 'overflowing with milk,' the agricultural metaphor became uncontainable enthusiasm.
Filled with lively energy and excitement; growing profusely.
From Latin 'exuberantem,' present participle of 'exuberare' (to be abundantly fruitful), from 'ex-' (out, thoroughly) + 'uberare' (to be fruitful), from 'uber' (udder, breast). To be exuberant is literally to be 'overflowing with milk' — bursting with nourishment like an overfull udder. Key roots: ex- (Latin: "out, thoroughly"), uber (Latin: "udder, breast; fruitful").
An 'exuberant' person is an overflowing udder. Latin 'uber' meant breast or udder, and 'exuberare' described a cow producing so much milk it was bursting. The agricultural image of uncontainable fruitfulness became the personality trait of uncontainable enthusiasm. German 'über' (over, super) is a cognate — so the ride-sharing company