More thread drift, relating to American interpretations. An Aussie mate was touring around the States, and made the mistake of wearing an Aussie T-shirt, with "G'day" on it.
A puzzled Yank fronted him and asked... "Hey, man... what's this GEE-DAY thing, you got on your shirt?..."
He was apparently puzzled as to whether it could be something related to G-men...