That's him pushing the stone up the hill, the jerk.
I call it a stone - it's nearer the size of a kirk.
When he first started out, it just used to irk,
but now its incenses me, and him, the absolute berk.
Carol Ann Duffy begins as she does in several of the poems in the collection with Mrs Sisyphus talking informally and  colloquially  to what is probably a group of women friends, confiding to them her anger at the behaviour of her husband. She is clearly comfortable enough with them to speak of him disparagingly as ‘the jerk’. It is noticeable that she doesn’t refer to her husband by name, but just as ‘him’ and a series of amusingly insulting descriptions. 
 The poem is in the form of a  dramatic monologue . This is a literary technique in which the speaker addresses an invisible listener. The reader pieces together the story, often dramatic and shocking, from what the speaker says.
Mrs Sisyphus