This song was written completely by Kim on guitar.
I don't have much to say about this song. Mike Watt pointed out in the video for "My Friend Goo" that "Goo" was supposed to any girl who had a boyfriend that played in a punk rock band. She represents fandom and a punk rock groupie. "Goo" is the rebellious girl all young teenage girls aspire to be but can't make that transition.
Not really played much live. "Goo" has not been played since 1991.