To be forced to make small talk for the sake of being polite. To be held back from completing tasks or reaching destinations due to having to engage is meaningless conversation, the subject of which could be couldn't be further from anything you are interested in.
It has the exact meaning of arsed, meaning bothered.
It comes from the wordanus, the excretory opening at the end of the alimentary canal syn: ARSED, arsehole, asshole. Therefore arsed and anus are the same word,meaning you can used anused as you wuld arsed