a usually preteen punk poser who worships the music played on the radio.(green day, coheed and cambria, 311, my chemical romance)They have no need for underground bands and watch MTV for hours hoping to see their favorite band onTRL.
John:i hear sean's playing "American Idiot" for talent show.
Ken:He's such a mainstreamer.
by nasera January 2, 2006
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A member of a popular croud with no soul, usually found at a middle school or highschool. They have zero taste in music or movies, they use these things as a way to get more popularity. They make tee-shirts that say "(insert event here) is life" or "I Heart (insert event here)" usually the event would be viewed as uncool so they get a large group of people to pretend it's cool so that they can all feel cooler.

anyone with a soul hates mainstreamers except for the head mainstreamer because they have control of the entire mainstream body
Dang those dumb mainstreamers made stupid bowling t-shirts and bragged about it for ever.

GOD DAMN, he sold out to the mainstream.!!!
by level -20 mainstreamer August 20, 2006
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In the opinion of morons, such as almost everyone posting on this page, mainstream is the epitomy of conformity and capitalistic exploitation tactics. To follow mainstream, in the opinion of such idiots, is to be weak and conformist.
Mainstream is marketable and appealling to the masses because it's popular and more likeable. Most "non-mainstream" artists would do anything to become mainstream.
Mainstream is frowned at by morons between the ages 14-24 due to their inability to see the wood through the trees.
by starky August 4, 2007
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1. Any outsider or member of a sub culture that is willing to do anything to be accepted and be identified as mainstream.
2. A member of a sub culture whose natural likes lean toward mainstream tastes.
Dude, I saw Tyrone, the other day at the Ratchet Club chatting up some debutantes. I didn't know he was a mainstreamer.
by Goldenboy62 January 27, 2011
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One who listens to Nirvana, My Chemical Romance, The Used, Nickelback, Green Day, System of a Down, Atreyu, Korn, Incubus, Hawthorne Heights etc.

Mainstreamers listen to Mainstream Rock, know nothing about Music and usually think Nirvana are grunge, and My Chemical Romance are Emo.
Mainstreamers are quite fond of Nirvana.
by Nirvana AREN'T Grunge March 31, 2006
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Doing something to appease the masses as opposed to keeping it the way it started.
Corspe Circus was selective about their stalkers, now they allow anyone in, They Mainstreamed.
by Kryptic916 December 17, 2011
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When a meme has become so popular that it appears on the news, TV, or anything else outside of message boards. When this happens, it is deemed too popular and forever called "OLD".
Rick Rolling has been a mainstream meme for a very long time. Cut it out.
by deathwish124 May 24, 2009
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