Generally when a friend tells me simply that he hooked up (were in our late 20's), it means he went to a bar and there was some kissing and groping, and little else.

To the OP, I ask for a little more info:

Are you simply asking whether or not it's worth your time to get laid by this girl? Your posting it here tells me I already know the answer to that, though. Also, what about her is painfully annoying? Calling you all the time is something they all do, and it's always annoying, unless every call is her telling you to come over and stuff her.