The definition of Geronimo was an Apache native American leader.
(noun)An example of Geronimo is an Apache leader who fought against the United States and Mexico in the Apache Wars.
Geronimo is defined as a way to express excitement or happiness, usually when doing something adventurous.
(interjection)An example of geronimo is what a sky diver would yell before jumping out of a plane.
See Geronimo in Webster's New World College Dictionary
Origin: Sp, Jerome, used as a nickname by the Mexicans
See Geronimo in American Heritage Dictionary 4
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