Also Known As M Night Shyamalan. A name that lots of people use when talking about direction M Night Shyamalan in a mean way. Or, used when one doesn't know how to pronounce his name.
Person 1: Dude, aren't M Night Shila... Sheila... Shiya...
Person 2: Man, just call him Shamalamadingdong!
Person 1: Okay... aren't M Night Shamalamadingdong's new movies gay?
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).