"Nah, NATSUMI'S chubby and thick, but Mimi is slim thick. She's skinny as fuck, but that ass and those titties still poke out, and they jiggle when she runs"
This is an expression that means a girl or woman is a little curvey. She might have larger (or thick) thighs, Good ass, and big boobs, but she is not fat or overweight. If you get called this, it’s a good thing.