Wiktionary
interj. (alternative spelling of Jiminy Cricket English)
Wikipedia
Jiminy Cricket is the Walt Disney version of The Talking Cricket , a fictional character created by Carlo Collodi for his children's book The Adventures of Pinocchio, which Disney adapted into the animated film Pinocchio in 1940. Originally an unnamed, minor character in Collodi's novel, he was transformed in the Disney version into a comical and wise partner who accompanies Pinocchio on his adventures, having been appointed by the Blue Fairy (known in the book as The Fairy with Turquoise Hair) to serve as Pinocchio's official conscience. Though called "cricket", he is depicted as a grasshopper instead, crickets being black or dark brown and with very long antennae. Since his debut in Pinocchio, he has become a recurring iconic Disney character and has made numerous other appearances.
Usage examples of "jiminy cricket".
He was ancient and vigorous, as powerful as a joker in the deck, a worn but still potent magician, an evil Jiminy Cricket.
I'm reasonably sure that in Disney's Pinocchio, Jiminy Cricket never sits on the brow of the whale.
It all would have been easier if Stark could have gotten into the apartment first, as he had done with the bitch, but a single glance was enough to convince him that these locks, unlike hers, had not been put in by jiminy Cricket.
As I've said elsewhere, I see myself as a combination of Jiminy Cricket and Zorro.