"Hiberniae" is after names of parents so may mean parents lived there. Have you compared it with entries for marriages of other Irish couples around same time? I think it was abode of parents. Logically therefore probably also birthplace of groom & bride.
Information in entries in Catholic marriage registers seems to vary depending on the priest. A priest might even have changed his format during his tenure.
For comparison some examples of marriages of Irish people from Catholic registers in England in mid-19th century in parishes with which I'm familiar. Transcriptions on Lancashire Online Parish Clerks.
St. Marie, Bury, Lancashire. Marriage register 1834-1867 and 1867-1885
www.lan-opc.org.uk/Bury/Bury/stmarie/index.htmlMarriage Register 1834-1867
Some entries state abode of both groom and bride as places in Ireland. Some give abode of parents. Abode of many parents was Ireland; town, city or county given for some. Information and format not consistent. Both parents were named for many early marriages. Fathers' names & abodes in 1849 & 1850.
Marriage Register 1867-1885
Both parents named in some early entries. 3 sets of parents were " of Hibernia" in 1867 and some more in 1868.
St. Joseph, Bury
www.lan-opc.org.uk/Bury/Bury/stjoseph/index.htmlFounded 1850s.
Marriage Register 1863-1902
Early entries in this register state abodes of groom & bride, names of fathers but not generally their abode, often addresses of witnesses.
St. Mary., Bacup, Lancashire
www.lan-opc.org.uk/Rossendale/Bacup/stmary/index.htmlMarriage Register 1854-1902
Information in early entries varied and was often sparse. 1854 names of groom & bride, fathers' names (often no forename of fathers in 1854 & 55), witness names. Began adding abodes of groom, bride and witnesses mid 1855.