An exclamation of excitement, typically used when one does something daring, especially jumping from a height. Jake peered out the open door of the airplane and yelled "Geronimo!" as he leapt out.
Geronimo!
(dʒəˈrɑnəmo)exclam. Here I go! (Originally said by parachutists leaving a plane. From Spanish for Jerome.) There’s my cue. Geronimo!