Stands for "Not Being Lez". Similar to the frequently used phrase "No Homo", but specifically geared towards women. If a woman says something that sounds unintentionally sexual to another woman, saying "NBL" or "Not Being Lez" afterwards is a way of making it clear that it was not intended to sound sexual. Its is also used ironically in the gay community.
Shyla - "OMG your cat is so soft! I just love your pussy!! ..NBL"
Adrianne - "Sure.."
Not bloody likely. A phrase difficult to misinterpret, a "no" that does not mean "yes" in any way. A "no" that means the user will do everything in his power to prevent whatever it is from occurring.
You: Are you going to watch the Super Bowl tonight?
Me: NBL, you know I hate professionalsports.
Stands for "nothin' but love" or "nothing but love". Used best when someone thinks they are feuding or in disagreement but they aren't actually so you say "nbl". Used to express mutual feelings for someone or a situation.
"What did you think when Hannah said you made up a story about her?"
"NBL"