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Usually in fanfiction, a pairing that is homosexual, although slash is rarely applied to yuri/lesbian pairings. The word 'slash' comes from Star Trek fandom. The original slash pairing was Kirk/Spock, which was abbreviated K/S, and then ended up just being called 'slash' after its punctuation mark. After that, other male/male pairings (in Trek, and in other fandoms soon after) also became known as slash.
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