When a person tries too hard to be right. When someone is MARVINING they force life and trying to be right about something.
JOHN: See I knew bob was a good player he just ran the ball for 1 yard. See i knew bob was a good player he has a nice edge up. See i knew bob was a nice player he went to an ELITE HS.
NASIR: HEY JOHN PLEASE STOP MARVINING