In a hurry, anxiety, fuss, agitation (used in adjectival phrase).
He was all a fooster over the arrangements.
He was excited and hurried about the arrangements.
Irish 'F√ļster' - fussiness, immediate haste. (Dinneen) And note "Perhaps our word is the result of confusing 'Fuadar' - haste, activity, with 'Fuarcal' panic, terror, and Cornish 'Fouster' - to bustle, to fuss about in a futile purposeless way." (√ď h-√Čaluithe)