Well, there’s two chimichanga story that I know.
First chimichanga story is originating from Tucson, Arizona. As the story goes a woman affiliated with the oldest mexican food restaurant, El Charro, accidentally dropped a burrito in the fryer. In her frustration she started to yell “chingado,” a spanish curse word, but mid-sentence she changed to chimichanga. Hence was born the deep-fried burrito, and over the years it became popular in Mexican restaurants everywhere.”