Used to describe the terrible noises that you must endure in a public restroom when you walk in and someone (or multiple persons) are in the process of taking a dump. Or, it can simply be an allusion to using the public restroom.
"I had to take a leak the other day, but the bathroom choir was in full session, so I got out of that restroom ASAP."

"I'll be back in a second. I have a practice session with the bathroom choir."
by Timstuff March 9, 2008
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The Mens Bathroom Choir (MBC) is a YouTube channel with around 14 boys that all sing together in their school's bathroom, however the person that records their school songs is female. They have covered songs such as: Drunken Sailor, The Avengers theme song, All I Want for Christmas is you, Radioactive, and The Lion Sleeps Tonight. Their most popular video (as of me writing this today) is Drunken Sailor. From the recent Coronavirus outbreak however, they have been uploading from their home bathrooms.
Guy 1: So, what are you doing in quarantine?
Guy 2: I'm learning Spanish!
Guy 3: I'm teaching my dog tricks!
Me: I have done nothing but watch the Mens Bathroom Choir for 3 weeks.
by kidzbopknowswhatyoudid April 16, 2020
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