NSGF

No Sex GirlFriend (noun). A girl who you share all the girlfriend experiences with but you don't have sex.

"Dude, you're stuck in a full-blown NSGF situation. You may as well start banging!"

NSGF

No Sound GirlFriend: A girlfriend who can stay quiet e.g. when you're trying to work.

I'm trying to work, are you going to let me read this? Can you be my NSGF, just for a bit?