when there is a couple and when they are together they are
going out, but when they are alone they are counted as single leaving them free to do as will.
Therefor it is when you and a girl/boy are not
officially a couple but you are more then
friends with benefits
guy 1 - dude, don't hook up with her you have your
girlfriend!
guy 2 - narr mate she's not my
girlfriend we are just 'single going out' and shes not here so i can
do what i want with who i want.
guy 1 - ohok mad bro, GO FOR IT!