A "Jesus freak" is a person who loves Jesus Christ very much and talks about Him a lot. It's like when you really like your favorite superhero or cartoon character and you want to tell everyone about them. Jesus freaks believe that Jesus is the Son of God and that He died on the cross to save people from their sins. They try to follow Jesus' teachings and help others do the same. Some people might use this term as a way of teasing or making fun of someone for their strong faith in Jesus, but being a Jesus freak is actually a good thing!