I've seen RA used to refer to providers, usually AAMP K-girls, and I can't find it in the glossaries.  
Some wild guesses:  Recent Arrival; Really Awesome; Random Asian; ... none sound convincing.  
Does it mean any provider, or a favorite, or a K-girl, or something more specific?  

describe providers RA=Relaxation Assistant. I am sure our BA bros can explain some of the other acronyms unique to the BA.  

I'd love to hear other interpretations.  
Even if they're freshly made up

I'm from BA and RA is commonly used to refer to Relaxation Assistant here. It is a term most commonly used to refer to providers at AMP/AAMP.

(fresh off the boat - an anachronism I suppose...)  instead of RA -   but this can of course apply to others besides K-girls who are recent immigrants or here temporarily from their home country to work....