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The term "a minced oath" is where you change the wording of a rude word to make it less offensive e.g. shoot, darn, heck ect.
"Bejeebus" is a minced oath used for the name of Jesus.
Dickens is a minced oath. It means devil.
It is a minced oath, for "I'll be damned," meaning "I am profoundly surprised and disturbed by this."
"Dadgummit" is a spoonerism of "God damn it". It is an example of what is called a "minced oath".