A pejorative nickname for someone from County Offaly, Ireland, particularly associated with Brian Cowen, Taoiseach of Ireland 2008–2011 (from that county)
As Biffo was the cover star at the time, and Buster's name was never in the title, this must be from The Beano Book 1957, not an issue of the comic.
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More recently Biffo was seen in a four-part special leading a group of retired characters, Pansy Potter, Keyhole Kate and Desert Island Dick, to return The Beano to an earlier form (specifically, the 1960s, the logo from that era was used in the story).
It features the voices of Thomas Bromhead as Rocket, Jamie Oxenbould as Vincent "Vinnie", Marcello Fabrizi as Vinnie's father, V. P. Stern, etc., Drew Forsythe as Ma Ducky (the mother of a trio of bullies known as The Duckies), Biffo and Scuds Ducky, Trilby Glover as Gabby and Maya and Rachel King as Crystal and Frankie Ducky (the youngest and only female of The Duckies).