Definition from Wiktionary, the free dictionary
to bang out (phrasal verb)
- (idiomatic) To do something quickly, in a slipshod, or unprofessional manner.
- I've got this paper due tomorrow, but I think I can bang it out in one night.
- The band were banging out a vaguely recognisable version of the Star Spangled Banner.
- The object may appear before or after the particle. If the object is a pronoun, then it must be before the particle.