This is a song I heard a few years ago. It was a long complex acapella song. If I remember correctly, it was wordless. It reminded me strongly of a Frank Zappa song because of its "obnoxious" attitude, it seemed like it might have been created on purpose to annoy people. If I had to guess, I'd think it might have been released in the early 2000's.
I got the feeling it was probably something a well-known band did as a lark, and I think it might have been live. It was definitely multiple voices (or multi-tracked, if it wasn't done live). As far as I remember it was wordless, like scat but in a pop/rock style (definitely not jazz).