to be willing, inclined , or prepared (esp in the phrase can't be arsed )
rat-arsed
drunk
half-arsed
incompetent ; inept ; badly organized
tight-arsed
inhibited or conservative in attitude or behaviour
blue-arsed fly
a blowfly ; bluebottle
arse about
to play the fool ; act stupidly, esp in an irritating manner
arse around
If you say that someone is arsing around or arsing about , you mean that they are behaving in a silly , irritating way instead of getting something done.