arigato UK /ˌɑːɹiˈɡɑːtəʊ/US /ˌɑːɹiˈɡɑːtoʊ/ exclamation1 •(informal) Thank you (used in the context of, or to evoke, Japanese culture).And though those arigato smiles/Stay in your memory for a while/There still seems more to come — 1974