Top definition
A person who listens to the less popular songs by hit artists.
Person 1: What are listening to?
Person 2: The Greatest Man That Ever Lived by Weezer.
Person 1: Didn't they make Pork and Beans?
Person 2: Yeah, this song is waaaay better.
Person 1: Wow, you're such a B-sider
by Jak Majik October 17, 2009
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