I asked, "Do you want me to sew it on the jacket?" She said, "Oh, yes, I am no good at those things; I would have put it on with a safety pin." She said that she didn't have any needles or thread; I told her I had a little sewing kit in my "work bag" in my car. I carry a purse, but I also have emergency items in another bag in the trunk of the car.
I said, "You're driving; I'll do it in the car; I'll have it done in a whipstitch."
She said she had never heard that usage.
I said, "Well, it's an idiom; my mother used to say it, but a whipstitch is also an actual stitch, but you don't use a whipstitch to attach a button."
Today, I looked for the definition of whipstitch and after the definition about sewing, it shows that, as an idiom, it means "at short intervals"; all of my life I've thought it meant "quickly"; I do learn something new each day, and sometimes, it's in a whipstitch!