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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 08, 2008
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