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 feelsorry, but you feel sorry enough to tell them bummer dude