morning noun ▶ the top of the morning!; top of the morning to you! used as a cheery greeting IRELAND,1815 A stereotypical Irish-ism.
No corn beef and cabbage cooking where I come from either ... come from an orphanage, goddamn orphanage, no Irish top-of-the-morning mother there either, just a big son-of-a-bitching German[.] — Lyle Kessler, Orphans, 1983