He wasn't. "Geronimo" in military tradition is a battlecry for going in fast, hard, without fear.
I remember as a kid using the term Geronimo frequently when playing among other boys. It was taken for granted that it was a term of action and of something difficult being done. This just doesn’t seem to have been used properly. Apaches are Americans for some time now and this is a insult. I’m no PC person at all and I see it.
I’ve always associated it with jumping out of an airplane, but maybe I’ve watched too much Bug’s Bunny...Or was it the Roadrunner? Either way, Geronimo was honorable.