jibbly means: A baby worm is called a jibbly. You can find it in the wild, also called the area beyond your home. Jibbleologists study jibblys. One day, a middle-school classroom created the word “jibbly”. Two 6th-grade boys had a big imagination and were the founders. You can also use Jibbly as a slang term. For example, that shirt is so jibbly. (in Community Dictionary, added by Heath Webster)