It has the exact meaning of arsed, meaning bothered.
It comes from the word anus, 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
"I can't be bothered to go out tonight"
"I can't be arsed to go out tonight"
"I can't be ANUSED to go out tonight
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