fooster verb 2noun 1forms 3 verb2 •(Ireland) To bustle about in a purposeless way; fidget. •(Ireland) To rummage; to engage in inept activity; to noodle."Speaking of which—" Fionn starts foostering in the pocket of his manky old jacket—"I've probably got something for you." — 2010 noun1 •(Ireland) A confused hurry; bustle. formsfoostered · foostering · foosters