Now I'm wondering what a Judas Priest is
From the term's WP page[0]:
A minced oath is a euphemistic expression formed by deliberately misspelling, mispronouncing, or replacing a part of a profane, blasphemous, or taboo word or phrase to reduce the original term's objectionable characteristics.
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Alliteration can be combined with metrical equivalence, as in the pseudo-blasphemous "Judas Priest", substituted for the blasphemous use of "Jesus Christ"