Up and down/over and back, like a blue arsed fly!

exp.

Heard in Sligo

Constantly running around (Depending on previous prepositions).

In use

Jaysus John will yeh sit down, Yer over and back like a blue arsed fly all day!

Posh English

Good Lord, John, will you sit down; you have been dashing back and forth like a frantic bluebottle all day!