1 definition by nasera

Top Definition
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 01, 2006

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