Just like any hobby or specialty... the people, the industry, and the distributors have their own lingo. It's almost another language. When I got into this, I would hear phrases and acronyms that made no sense whatsoever. RTF, ARF, Glow, Stick Plane, ESC, Buddy box, etc. What does it all mean?!?
Here is an excellent resource for obscure terms, acronyms and so much more...
http://www.rc-airplane-world.com/rc-flying-glossary.html
http://www.rc-airplane-world.com/rc-flying-glossary.html