thing-a-ma-jiggy Share definition Flag A word used for taking the place of the name of an object, when you aren't sure in what way you should say it. Something went wrong with the thing-a-ma-jiggy during an experiment in science class. thing-a-ma-jiggy by ebonyanddomino July 5, 2009 0 0 Get merch Get the thing-a-ma-jiggy mug. Buy Now — $32.95 See more merch