We all tend to use a weird type of shorthand/lingo, don't feel bad. It took me a few years after joing the club to figure out all of the terms.
Black water, We all can figure this one out, but it is not accurate.
Grey water, now PC as wash water
White water or fresh water
Gaucho otherwise known as couch/jackknife sofa/sleeper sofa
Side pull out= side gaucho???
RD, rear double
CT, center twin
RT, rear twin
and the list goes on.................
Don't get me started on the chat/web shorthand, LOL.
Soak it all up and you can impress your friends with totally usless arcane knowlege!