full of squirrels

Being totally and completely distractible, unable to pay attention. Similar to Dug the dog in the Pixar film Up.

I've got buckle down and finish this spreadsheet for the meeting this afternoo... OH LOOK, A BUTTERFLY! No, I must concentrate, this is very import...SUDDEN URGE TO CHECK CELL PHONE. Darn it, I'm so full of squirrels today I just can't focus!