One who's stories are far taller than his short status.
No matter what you've done he's done it twice as fast, twice as good, and three times cooler.
His ego usually overshadows his stature, which is typically on the shorter side of the spectrum.
You: Hey man, I just got into a car wreck. :(
Seth: Man! That's nothing! Just last week I got into 5 car wrecks at the same time AND I did a barrel roll, while banging this chick she was totally hot. ;)
You: You're short. *walk away*