Help me Peetah I have a PhD in History but still not get this

Peter, I'm not good at abbreviations. Please help

Why are the Captains nervous Peter?

Petah? Job interview Petah?

What is this guy talking about?

I don't understand, Petah...

Petah help

What are the chances of Book 3 Sokka beating Zuko using swords only

So I'm learning about ultrasound imaging and I just can't get this image out of my head

How do you hold a regular waterbender criminal without dehydrating them? (Not talking about Ming Hua level just basic bank robber type )

Who’s the best?