freebeer
To display my ignorance of the lingua franca Englisch, I've never seen the O' with-apostrophe prefix for the opossum roadkill that made up most of me diet as a young'un.
Y'awl know them thar is possums.  If I were a bit more edumacatified like them city folks, ah'd be a-callin' them varmints opossums.  If ah had had me a dee-greee in latin, I'da reckon they'd be a phalanx of opossa.
But I don't think they be Irish.
To be briefly serious, I'll have to text-search before I can comment on the user feedback (which unless obviously bogus, I take as inherently a well-meant correction, if perhaps incorrectly typed)