Hi Exoblade!
Thanks for posting the link
I didn't notice the word for restroom being brought up in there. I knew though that there has been a phrase for this since this April 2013 post on Frommer's blog
“Where’s the bathroom?” and other useful things | Na'viteri.org However, the name for an actual place one releases waste (fngä'tseng) I did not see anywhere until I saw it on one of the cards for the translator device sold at the World of Pandora in Disney Animal Kingdom.
I'm happy that this board sees some life again
cheers