Spendy means expensive — but it is casual, chatty slang, not a word for writing. It sounds relaxed and slightly softening, the way you might comment on a price without complaining too hard: 'Nice restaurant, but a bit spendy.' It is most common in the American Pacific Northwest (Oregon, Washington), where it is thoroughly ordinary, and it has spread from there; some English speakers elsewhere have never heard it and will still understand it instantly, because the shape of the word explains itself. There is a second, less common use, describing a person who spends a lot: 'I get spendy when I'm stressed.' The word is built the simple way English builds informal describing words — take a word and add -y, like 'sleepy', 'chatty', 'grabby'. That is also why it feels light: -y words often sound friendly or childlike, which is exactly the tone that makes 'spendy' softer than 'expensive'.

貴（口語、非正式的說法，帶點輕鬆語氣）