This is the song Stewie performs after Brian calls him a douche in the episode
Ocean s Three and a Half.
Then Brian comes in and I change up the tempo
Brian comes in and I change up the song
Looking at me like he thinks I m a douchebag
But he s gonna learn pretty fast that he s wrong
Why are you bringing me down, man?
Why are you bringing me down?
Don t bring me down!
(On the last line do a hard strum with each word)
Enjoy.