In season 4 episode 8 called “Something You Can Do With Your Finger” Cartman and the gang make a boy band called “Fingerbang”. In this episode, Randy Marsh shares his tale of being in a boy band in the 80s called “The Ghetto Avenue Boys” where he wears this shirt. That’s about all I remember about this episode as I haven’t seen it in ages.

Here’s the link to the product as a sticker, but you can view the design on multiple items if you’re interested.