Up me arse picking daisies

exp.

An unfortunate expression used to sarcastically stress that one does not know where somebody is.

In use

Biddy: "Where's mammy?" Peggy: "Up me arse picking daisies!"

Let Lawrence Muck translate it to posh English for you
Lawrence Muck

Ah, a person of taste, I see. Would you like me to translate 'Up me arse picking daisies' in use for you?

'Where is Mother?' 'I have not the faintest idea, picking daisies up my posterior!'