No, your teacher isn't speaking gibberish. He or she is probably speaking Sanskrit– an ancient language from southern India. Here are the 5 words you'll hear most frequently in your classes.
My first yoga teacher put the accent on the second syllable, like this: ah-SAW'-nah. I still think that has a nice ring to it. But the correct pronunciation is AH'-sah-nah. Literally, it means "seat," but in yoga class it's pretty much interchangeable with the word "pose." For example, Balasana = Child's Pose, Navasana = Boat Pose... and so on.
This is my favorite Sanskrit word because it's fun to say--nah'-mah'-stay. It means: The divine light within me salutes the divine light within you. My incredibly simplified translation: I'm awesome. You're awesome. All these other people are awesome. Isn't it awesome that we just practiced yoga together? Thanks for your presence.
Ooooooohhhhhmmmmmmm. Apparently, this is the sound of the universe. The written version of Om has become a universal symbol of yoga–it adorns yoga studio walls and is tattooed on yoga students everywhere. But what does it mean? Essentially, we are all a part of this universe--always moving, always changing, always breathing. When you chant Om, you're tapping into that vibration.
Peace. When you chant, "Om shanti shanti shanti," it's an invocation of peace. In Buddhist and Hindu traditions you chant shanti three times to represent peace in body, speech, and mind.
We all know that yoga is the union of body, mind, and spirit. That's what the word yoga means--yoke or union. It is, indeed, the practice of connecting our body, mind, and spirit, but it can mean more than that, too. It's about connecting us to ourselves, each other, our environment, and, eventually, our truth.