The action of walking into someone in the shower, where you don't quiet see the person's naked body, however you do see the outline of their public hair (especially in females) in the form of a black triangle.
Dude! He walked in on me in the shower and saw my black triangle. And just kept staring!
Her black triangle has clearly been shaved off.
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Like the inverted pink triangle, only representing lesbian pride rather than gay male pride.
She was proud of being a lesbian, and had no fear, so she wore the Inverted Black Triangle around her neck on a chain.
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