In a hurry, anxiety, fuss, agitation (used in adjectival phrase).
Use:
He was all a fooster over the arrangements.
He was excited and hurried about the arrangements.
Derivation:
Irish 'Fúster' - 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." (Ó h-Éaluithe)