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Comes from tabletop games and other games that use dice in combat mechanics. Generally, when a big fight is about to go down, players will "roll for initiative" and whoever gets the higher roll gets to go first.

So, "roll for initiative" can be used as an (intentionally nerdy) synonym for "initiate a fight".
"You look like a bitch"
"Don't make me roll for initiative, motherfucker"
by DC-R March 14, 2016
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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