1 definition by That guy you met that time

Top Definition
Those kids you see in the mall (usually around Hot Topic) that have multi-colored hair and listen to trendy dime-a-dozen bands that they and only they define as "emo".

Derived from the words "Mainstream" and "Emo".
Look a horde of depressed mainstreamos just showed up in the food court! Run for your lives!
by That guy you met that time April 18, 2011
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