'Fattened' in the Bible

And bring the fattened calf and slaughter it, and let us [invite everyone and] feast and celebrate;

And he said to him, ‘Your brother has come, and your father has killed the fattened calf because he has received him back safe and sound.’

but when this [other] son of yours arrived, who has devoured your estate with immoral women, you slaughtered that fattened calf for him!’

On the earth you have lived luxuriously and abandoned yourselves to soft living and led a life of wanton pleasure [self-indulgence, self-gratification]; you have fattened your hearts in a day of slaughter.