What does concubine mean in Nanchang dialect translation?

For example, some indecent words or dirty jokes can be told casually. Very funny, shameless, not straight. Sometimes friends joke and say some dirty jokes, which makes people feel so shy. They will say: tender and fat ~ ~ which means in Hong Kong (wow) yo ~ ~ which means: you are a shapeless person. . Can you say that casually? Don't say that. . Something like this ~ ~