Can't-be-arsed as an adjective?
Can't be arsed means can't be bothered. It means that one can't be bothered to do something. I've seen it being used as an adjective. What could can't be arsed ice cream mean?
The original texts says:
Apple pizza with can't be arsed ice cream.
This is a "recipe given to me by my mum, to impress people when they came round to my crap house for crap dinner parties, requiring zero skill or effort." Source
Parse it as can't-be-arsed ice cream: that is, ice cream which you want to create with as little effort as possible.