It is a Defensive player Somewhere inbetween a Linebacker and Defensive-Back (Corner, Free Safety & Strong Safety). A Monster Back is usually set to rome the feild freely, most monster backs are Strong Safeties such as Brian Dawkins & Troy polamalu.
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It is a defensive back who lines up on the strong side of the offensive formation. Typically the monster back lines up on or near the offenses "tight end" and reads/reacts to what the tight end does.