Please decribe.

But I knew most of the Countries (greek, russian, french) as a non-hobbiest and the term missionary was taught in sex-ed for cryin' out loud.  Cowgirl you can figure out quick enough as a civilian but maybe if he volunteers Reverse-cg, "your miliage may vary", "Provider", or just mentions "escort" you could raise your percentage.  You won't know for sure unless you fish around because he could just be reading TER without hobbying.  If he's talking this frankly I'll bet he's at least given it serious consideration.  And if he's talking this frankly you can fish pretty easy..."would you ever pay for it?",  "has a hooker ever propositioned you?",  "how much would you give me to whack you on the head with my daquari straw?"

he throwing out that made you even think he might be a hobbyist to begin with?

If he's using this many terms, he's probably testing you out suspecting you're a provider.  

It sounds like he's at least lurked on hobby boards before.  It's either one of three things: a) he's not a hobbyist, yet; b) he's a hobbyist, c) he's a cop looking to entrap.

Many of the terms are probably in use in the general population.  But the acronyms would not be. If you said "DATY," as a double-entendre in a sentence that would normally call for "dating," would his ears perk up?  

/Zin

maybe ask how his experience with girlfriends has been.  If he's an idiot like me he may come back with a play on GFE (depends if alcohol has been involved and how serious he's taking the conversation).

Also, terms like mish and cowgirl I think are fairly standard - I don't think BBJ or daty are ??? (certainly dining at the Y is but perhaps not its acronym)

Ever read the Playboy Advisor?  They use these terms all the time.  What's the big deal if he's a hobbiest or not?  If you really want to know... just ask him?  "Ever see an escort?".  He just may tell you if he wants to get in your pants!