Also, quick as a bunny or a flash . Very speedily, as in He was out of here quick as a wink , or She answered, quick as a bunny . These similes have largely replaced the earlier quick as lightning , although quick as a flash no doubt alludes to it (also see like greased lightning ), and quick as thought , now obsolete. The bunny variant dates from the mid-1800s, the others from the late 1800s.