A true Jesus Freak is one whose life has been changed by the unfailing love of Jesus Christ. They spend time in his word and choose to live for him. They do not try to cram Jesus down your throat, but instead they simply try to show you the love of Christ by their actions and behaviors. They trust that God will do the rest.
(Note: True Jesus Freaks do not live this way as an act, they are genuine people.)
Nick is such a nice guy, it wouldn't surprise me if he is a Jesus Freak.