The Simpsons are watching a television show , Before they were famous,talking about Rainier Wolfcastle and his first appearance in an Austrian commercial about a brand of bratwurst.
My bratwurst has a first name it's
My bratwurst has a second name it's
Behind the laughter
The song and title are a parody of the commercial jingle "My bologna has a first name, it's 'O-S-C-A-R'..." from the brand Oscar Mayer which also sold bratwursts.