Topic Pandaren Language
It can be amusing. It can be facepalm worthy.
I won't lie, when I first saw this while RPing, my heart sunk. But really it's harmless, kind of cute, and it's very easy for me to use Pandaren words while speaking in Common.
"May the Om nom be with you."
It's a foreign language. You can't really discern all the sounds the words make, other than a general idea of how does the language sound.
When a non-pandaren listens to pandaren speech, their language sounds to them as if it's "om nom nom", the same way German sounds "ANGRY ANGRY ANGRY YELLING" to non-German speakers, etc.
What you see in your chat is not the words being said themselves, but how does your character hear their speech. The same way not all "zugas" would mean the same thing, even if an Alliance member would hear them all like that.