When Andy was pulling his shit on luvscharlie, he put on an outrageous good ol' boy Southern accent. This was at the same time he had an Oirish accent for other people.

Incidentally, as a bona fide linguist, I can tell you unequivocally that his claims about having an Irish accent b/c his grandfather raised him blah blah blah are complete bullshit. That's not how accents work. This is even leaving aside the research that a nonnie on FFA did that destroyed all those claims about his Irish grandpa and heritage.