An individual that habitually one ups any story told, often referring back to previous experiences. These experiences are usually false, however can contain a hint of the truth. The stories are very frequent around females. When a story is one upped by two or more people, a Nah Dude fest occurs.
Can also be used as a verb: to nah dude
One up; top a story
Kid: "I ate 3 burritos at lunch today, I was so hungry."
Nah Dude: "Nah dude in my high school, I ate 5 burritos, and had dessert!"
A term used to indicate that an unfortunate event happened to one of your friends and you do not really feel sorry, but you feel sorry enough to tell them bummer dude