From Halopedia, the Halo wiki
Undercover is a spy drama television show airing around 2553. The AI Black-Box summarizes it as two secret agents always running out of restaurants without paying, never using the bathroom, and having shootouts in the street in front of people who never take their picture. He referred to it as the world's worst TV drama. When Mal and Vaz missed two radio checks, Serin Osman wondered what they do on the show in this case.
BB's quip about Undercover's characters never using the bathroom is a satirical reference to the FOX TV series 24. It is often joked that 24's protagonist, Jack Bauer, is never seen doing so, despite the show occurring in real time.
List of appearances