https://www.gotquestions.org/Jesus-freak.html
"While it was originally used as a pejorative, Jesus freak has become accepted and even embraced by many in the Christian community. A “Jesus Freak” song and album by the Christian band DC Talk in 1995 helped popularize the term. This is perhaps similar to the term Christian, which seemingly originated as an insult (Acts 11:26), but later became the most widely accepted term for a follower of Jesus Christ. If obsession with Jesus is indeed the core meaning of Jesus freak, then, yes, a Jesus freak is precisely what a Christian should strive to be (Matthew 16:24)."