1 definition by EatShitErryday

Top Definition
The complete opposite of "mainstream." It IS a horrible play on words. It is a new way to refer to a hipster without them getting pissed off (cause hipsters hate to be called hipsters).
"I thought you were too mainstream to have a facebook"

"Na, I's sidebrook"
by EatShitErryday May 17, 2012

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