She is a White Throat Savanna Monitor. Banger got her name from a sound monitors make.
Monitors use their tails as a defensive weapon.
Banger was an animal rescue of mine. I found her in very poor conditions, being kept in very poor surroundings. Fully grown, a little more than five feet in length, she was being housed in 50 gallon fish aquarium. She was badly scared and missing a piece of her tail. The sight of it made me heart sick.