The Expat Accent leans more towards a very bookish English with well-enunciated speech patterns because the people you're speaking to probably know some English, but it's Book English, with a limited accent and minimal slang. So Expat English comes across as Formal English to native speakers.
@MookyTroubadour Yes! I've picked up weird phrases and pronunciations from so many places.
@LianaBrooks that’s no fun. I adopted strange idiomatic expressions in my travels. For example from Scotland I learned “He could talk the back legs off a donkey”. They really have a gift.