"They each had their own room and all. They were both around seventy years old, or even more than that. They got a bang out of things, though--in a half-assed way, of course." -- J. D. Salinger The Catcher in the Rye
What does "get a bang out of things" and "half-assed" mean?
"Get a bang out of" means to really enjoy something, to get excited by it.
"Half-assed" means slipshod, sloppy, something done poorly or incompletely.