Green’s Dictionary of Slang

a derog. term for an Irish person; thus ext. as any stupid country person.

1969		L. Hadow Full Cycle 179: He can get into more trouble than a left-handed bogger working with a right-handed mate.
1978		Maledicta II:1+2 (Summer/Winter) 152: Bogger, [...] Irish countryfolk in Ireland itself; anyone of Irish descent elsewhere. From the peat-bogs of Ireland, chief source of fuel and fertilizer for Irish peasants.
1997–2002		Hope College ‘Dict. of New Terms’ 🌐 bogger n. Irish slang pejorative for a person from the country. A rural person. Often associated with a rural accent, vocabulary, or farm background.
1998		A. Warner Sopranos 45: This ugly bogger guy, driving the tractor.
2005		P. Howard Curious Incident of the Dog in the Nightdress 89: Our next opponents [...] the boggers of Newbridge College.
2021		L. McInerney Rules of Revelation 25: For dessert there were bottles of local craft beer – ‘Bogger Bräu’, Davy called it.