To make or compose something, esp to write something, in a hurry; cobble up (1940s+)
George twisted his legs into a yet firmer knot: "But two failures would wipe it bang out."
It was the junior officers' mess, and when the coffee came, a young ensign went to the piano and began to bang out a popular tune.
You know I really got a bang out of the way Roger jumped back from that waddling ground bird yesterday.
Often I have passed a man to get a supposedly poor batter up and then had him bang out a base hit.