A pun on the curse, Jesus Crisp. Mostly used by people who can't say, "Jesus Christ", people with a sense of humor, or hungry people.
Church Student, "Cheezus Crisp!"
Priest, "Did you just say Jesus's name in vain?!"
Church Student, "No, I said cheese... I'm kind of hungry..."
Priest, "Ah, ok, continue on with your work."