Take it any way you like.
I either mean:
are you pretty much available when someone asks you if you want to go out for a drink or are you one of these twats that's booked up for months on end
can you get one of your feet behind your head etc
The permanently booked up get on my fucking nerves but I'm not bothered how bodily flexible you are - unless we're, you know, doing it and then I want you Olympic standard like what I am.