If you say that someone. Got out of the wrong side of the bed. It means that they are in a bad mood usually for no obvious reason. Why does it mean this. This saying comes from an old superstition that if you put your left foot on the floor first when getting out of bed, you would have bad luck all day. Jake is in a terrible mood this morning. He seems to have. Got out of the wrong side of the bed. نوشته شده در شنبه هشتم مرداد ۱۳۹۰ ساعت 20:53 توسط زبان آموزان. با سلام خدمت همه اساتید و زبان آموزان گرامی:.