Things Peter says a lot:

He uses "mine" instead of "my". ie: "It's mine hat." "Baby you can drive mine car." It sounds kind of German. 

"I uh go-ah too!"

"Two of them!"

"It good!"

"It's hot, hot stuff." (When putting him in his car seat.)

"Not nice, it hurts." (When he pinches me.)

"Great."

"Oh, good."

"BrahmBraaahh" With the "br"s being trilled. (It means water.)

Peter's favorite songs:

Lucy in the Sky With Diamonds
Bear in the Big Blue House
Real Gone (McQueen Song!)
I am a Child of God (Nursery Song)