suddenly, without any planning and for no obvious reason He'd buy her expensive clothing at the drop of a hat and worry about how he would pay for it later. I hate to speak in public, but she'll get up on stage at the drop of a hat. if you do something at the drop of a hat, you do it suddenly and easily, often without any preparation I can't go rushing off to Florida at the drop of a hat. We now have a situation where laws may be cha...