Something (usually food or a drink) that tastes really good. Taken from the movie BFG, where he makes a nice comment about eating eggs and toast provided by the Queen of England.
"MMMM! There's only one word for that, Majester. Scrumdiddlyumptious. Oh, that is GLUMMY." - The BFG while enjoying his enormous egg and toast breakfast.
When you are sucking on your girls toes and asking her to pop a titty for daddy, while you inflate her by farting into her mouth and rubbing your tummy.
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.