Geronimo1
/dʒəˈrɒnɪməʊ
/ (Circa 1829–1909), Apache chief; Apache name Goyathlay. He led his people in raids on settlers and US troops before surrendering in 1886.
Geronimo2
/dʒəˈrɒnɪməʊ/exclamation
Used to express exhilaration, especially when leaping from a great height or moving at speed: Jimmy shouted as he rode—‘Geronimo!’
Origin
Second World War: by association with Geronimo1, adopted as a slogan by American paratroopers.