"Idahog" is a slang term for an Idaho girl, some of which are quite homely. There are very few young adult chicks in many Idaho towns, as many of them after they grow up pack up and seek their fortunes elsewhere.
Greg was on a cross-country vacation tour of the nation and one night he stayed in Pocatello. He went to Freddy's bar and picked up a girl because he "had to have his action" that night. He thought, "She's an Idahog, but she'll do."
by I Saw U2 Live Twice November 7, 2007