The left side.
The Bloods often "wear" their colors by sticking a red bandanna in their right back pocket. Therefore, the Crips (who are a rival gang) would consider the sporting of a blue "flag" on the opposite side of the Bloods to be the "Crip Side."
A term popularized by Snoop Dogg in his song "Drop It Like It's Hot."
"I keep a blue flag hanging out my backside
But only on the left side, yeah that's the Crip side"
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