The best girlfriend you could ever possibly want to have, or ask for. Although she'll probably try to leave you, and you'll probably try to leave her, you realize that nothing could be better, and you'd be an idiot to let her go. Also can mean; sexy, smart, funny, kind, loving, creative, amazing.
Girl: Hey did you see that really awesome chick over there?
Jan's Girlfriend: Oh yeah I did, she was totally a Jan!