bash out

verb2

1. •
   (informal) To write or type something very quickly, without much thought.

   • I've got about an hour in which to bash something out for the morning edition.
2. •
   (informal) To play (a tune) clumsily on a piano or similar instrument.

   • Well, by the mid-'70s Patti Smith really couldn't help it: she was bashing out guitar feedback, copping Keith Richards stances, and screaming out raw poetry laced with surreal images. — 1990