Could you explain "bang" and "haif-assed" in the text below?
Here's an extract from The catcher in the rye by J.D. Salinger;

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 haif-assed way, of course. I know that sounds mean to say, but I don't
mean it mean.

Question

Could you explain "bang" and "haif-assed" in the text below?
Here's an extract from The catcher in the rye by J.D. Salinger;

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 haif-assed  way,  of course.  I know that sounds mean to say, but  I don't
mean it mean.

Answer

Hello Saieed Gharaati. How are you?

Bang out of...  refers to getting   excitement out of life.

Half-Assed,  refers to a modest  effort.  In English one commonly sees  references to people doing something, or performing some task, with a less than complete effort, or with less than an enthusiastic effort.  Thus it is said;  "If you are going to do something Half-Assed, don't do it at all."

The older gentlemen in the Salinger story, have a mild  excitement or a Half-Assed excitement.  
---Warm Regards, Bruce

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