In short, she is just perfect.
A Carolyn will get along with nearly anyone and always knows what to say to cheer you up. She is a great friend and would never ever betray you. She would care for you no matter what.
The name Carolyn translates to "song of happiness" (from the word "Carol".) It is also commonly confused with the name Caroline. A Carolyn is the kind of girl who, once you meet her, she will always be in your heart.
Dude #2: O RLY?
Dude #1: oh yeah, she's def a Carolyn
Dude #2: word
Guy #1: you seen that new girl in school, man?
Guy #2: no, please elucidate
Guy #1: she's really nice and really cute and she plays in the band, acts, sings, and is really smart.
Guy #2: lemme guess... her name is Carolyn?
Guy #1: ZOMG yeah it is!!!1 u totally called it, man.
Guy #2: Roflcoptersaurus rex