The University of Colorado Boulder, abbreviated as UCB, is a university located in Boulder, Colorado. It appears in the Season Fifteen episode, "Crack Baby Athletic Association". It is also mentioned in the episode "Die Hippie, Die", as a sticker on a hippie's car, and also in the episode, "Raising the Bar".
In "Crack Baby Athletic Association", Cartman starts a non-profit charity called the Crack Baby Athletic Association (CBAA). He tries to make a trade deal with the dean of UCB, but is kicked out after the dean gets irritated and disgusted with Cartman's comments.
The outside of the university and the dean's office were the only parts of the university shown on South Park.