Gentleman,

Although not a newbie, I was stumped when I came across a few acronyms I hadn't seen before. Specifically, BLS and CBTNW.

Anyone?

Never heard of them, where did you see them. I suspect they were made up or a hoax of some sort.

BLS is not quite an acronym, it refers to ball sucking.  It is quite common on a Canadian review board called canbest.  For instance: "Her service is great (dining at the Y, excellent BLS and BBBJ)"

I can't help you with the other one I've never seen it before.