what does it mean if a girl wants to hangout ?

maybe she likes you

It probably means that she wants to spend some time with you to try to get to know you better. The key question is whether or not she's a strong person.

May I suggest that the first question to ask yourself when considering whether or not to date someone is, “Is this person a strong person?” If they’re not, no matter how much you like them, how much they like you, or how “cute” or “hot” they are, - please don’t date them. A strong person has good character (honesty, integrity, trustworthiness), displays a positive attitude (cheerful, caring, friendly, forgiving, helpful, and respectful), fulfills their responsibilities (for handling people who are pains in a positive way, for always trying to make a good choice, for taking care of themselves, for serving others), gives their best effort, and demonstrates self-control (of their body, anger, mouth and money).

My suggestion is that you put in the effort necessary to become a strong person (if you’re not already), don't hang out with this girl unless she’s a strong person, and eventually look for this type of girl (otherwise you’re setting yourself up for a broken heart). Unfortunately this type of woman is difficult to find - but save yourself the heartache and don’t settle for less.

(Please remember that you eventually want a 50 or 60 year marriage - not a 5 or 10 year marriage.)

Hope this helps!

PS Strong men attract strong women like magnets (as well as weak women - so be careful). The best way to get to know a strong woman without dating is to participate in the activities of a community service or a school organization.

if she said "hang out", it could be : have sex, just talk, 

She would enjoy your company and would like to spend time with you but doesn't want to be treated as a creature from outer space.  Merely be treated as a human being who just happens to be a girl.

she probably likes you