Someone who is SO obsessed with Jesus, they will never see anything ever wrong with him, always love him. They will pressure you (annoyingly) about it constantly until you run away screaming.
Gotta kill them all!
Jesus freak: "God is real to you you shouldn't be fake to god he loves you."
John: "What? I was just standing here."
Jesus Freak: "God loves you."
John: "I'm not even religious!"
Jesus Freak: "You should be, Jesus loves you and is deep inside you soul."
John: "AHH SHUT THE HELL UP! YOUR CRAZY!" *runs away*
Jesus Freak: "He's going to hell :("