Someone who is fond of remembering special moments in time. They are people who collect memories in all forms, whether it's pictures, video footage, sound bites or baby teeth.
My mother has kept everything from my baby boots, to locks of hair from my first haircut, to video footage of me at every birthday I ever had. She's a real doogenflicky.
That which cannot be named. Used as a substitute for the name of an object that you don't know or that you have forgotten in the deep recesses of your mind. The word is usually preceded by a pause as you perform a mental search for the object's name... unsuccessfully.