An extremely cool person. Also like a monastery but that just makes her cooler, two meanings in one.
If you know an Abbey then you're probably really lucky because most Abbey's are very cool.
She also probably knows the Rasputin dance from just dance.
Guy: Hey what's your name?
Abbey: It's Abbey
Guy: Wow you must be very cool. I'm so lucky that I know an Abbey
Abbey: Hell yeah you are.