To vehemently maintain that one is awesome at
something, despite evidence that the person actually really sucks at it.
The act of not having the sense to admitting
one's deficiencies in
something right after proving that one is deficient.
-"Dude you just scored an own goal!"
-"No man, I'm awesome. It was just the wind, I'll score the next goal."
-"Dude, don't pull a uni..."
If you act like a player in front of your
friends, then freeze up when talking with a chick, then brag to your
friends about what a player you are later that
night then you just pulled a uni.