Peanuts...you know, Charlie Brown and Snoopy. He's saying they sounds like Peanuts parents, but to my recollection it's the teacher's in the cartoon he's referring to where everything they'd say came out inaudible like "bwah-boo bah bah dah bwah". In short, he was referincing that he could hear what people were saying but he couldn't make sense of any of it because of his state of mind.