The first is a real question, the second is not. But they are both used colloquially.
Aren't you guys going to hang out?
You guys aren't going to hang out?
Are both okay?
In Br Eng (I'm not sensitive to Am E intonation; it may be the same over there) the first is said from the point of view 'Surely you are...?'
The second can have either of two intonations, which impart different meanings:
- Rising all the way [ -> 'Surely you are.' (Picture their eyebrows going up as they say it. )]
- Rising as far as 'aren't', then dipping and rising again (often to a higher pitch) through 'going to hang out?' [ -> Surely not - it's risky/dangerous/suicide/illegal/against the rules...<any-other-negative-thing>]
Last edited by BobK; 25-Nov-2014 at 15:17. Reason: Attached diag.