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A weird invertebrate insect that reproduces through penis swordfighting. The first worm that is stabbed by it's opponent accepts the other flatworms penis and allows it to inject it with it's cum. This term may be used to describe a faggot who is bad at fencing.
noun: I was in my hot tub masturbating when on the side I saw two flatworms swordfighting.
adjective: Do not adopt that Malaysian orphan because he is a flatworm.
by Abu Nazir December 26, 2014
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