A stomach ache brought on by the consumption of large ammounts of gummy worms, gummy bears, and/or other gummies.
Gummy tummy has a distinctive feeling, unlike that of any other food related stomach ache.
Mark ate a whole tub of gummy worms. Dude had severe gummy tummy after that.
the end result of tummy sticks
Due to excessive body hair, gummy tummy was the bane of Jer-Bear's alternate lifestyle.