foos·ter I. \ˈfüst(h)ər\noun (-s) Etymology: Irish Gaelic fūstar chiefly Irish: fuss, bustle, to-do II. intransitive verb (-ed/-ing/-s) chiefly Irish: to bustle around : fluster; especially: to waste time by fussing and chattering < you can't expect children to concentrate when everybody's gabbling and foostering around them — Michael McLaverty >