Megadon is one of the best friends you could ever have. Shes so pretty. If you use "Megadon" in a sentence, it mean that you're referring to you're best friend as a true best friend.
A unit for measuring the coolness of something. The origin of this scientific unit is the animated television show Futurama. Professor Hubert Farnesworth invents a Coolometer, which uses Megafonzies as a unit for coolness.
When pointed at www.urbandictionary.com, the coolometer is give a reading of over 50 Megafonzies!
The act of dunking on someone so hard in a competitive aspect, whether in sports or anywhere else to the point where they may question their religion and consider attempting suicide.
The enemy team was megadunked so hard they disbanded and renamed themselves one daylater.
Smot was megadunked so much that he lived the rest of his days out as a fisherman.