Ran across two things Is never seen in reviews before: “BLS” and “singing.” Any answers?

BLS: Ball Licking and Sucking (or basic life support)  
Unsure on singing

Ball Licking and Sucking is accomplished with Ball Sucking Lips.
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There's a TER Abbreviation list here:
http://www.theeroticreview.com/discussion_boards/viewmsg.asp?MessageID=75535&boardID=33
http://www.theeroticreview.com/discussion-boards/newbie---faq-33/ters-instruction-manual-75528

of acronyms in the "self-help center" in two volumes.  Here's a link to the first half to get you started.   If you don't find it here, then ask the board because it might be something new.  

what Muff Cabbage is.

Although unfortunately it would be best if practiced by someone with a low, low, voice (something only gay guys get to experience🙁), I could see how a woman could do it and transmit a nice vibrator sensation to your beloved cock while she sucks it... after she provided a good BLS (ball licking service).

a muff cabbage expert, I will not dispute it.  Lol

"Ball Licking Service", it's Ball Licking and Sucking.  See what I mean about your knowledge level?  Lol

http://www.theeroticreview.com/discussion-boards/new-york-2/don-rickles-265463
Don Rickles used to have a line about inviting an aspiring songbird to come back to his dressing room where she can sing on his finger.

Well, not really, not guilty *as charged* anyways. I was too tired and feeling prickly at the time that I threw it out there without an explanation. It was off a list from craigslist back in the day. I absolutely KNEW it would attract a gadfly or two, and yet I posted it anyways. Why? I can't explain. It's weird. And it won't be the last time I do something like that, despite the fact it would make my life easier if I explained myself or put off posting until I was ready to.