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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
exclam. Here I go! (Originally said by parachutists leaving a plane. From Spanish for Jerome.) There’s my cue. Geronimo!
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.