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A term used to refer to women that are sexually promiscuous and open about it. The term originates from a combination of the idea of a mart where many people can come and go, taking what they want, and the lesser know hina, which in polynesian lore literally translates to girl.

Thus a marthina is a girl that many people can come take what they want from.
1: Did you see that marthina at the party last night?
2: OMG she made out with Jaymie and Mark right after each other! She's definitely a marthina!
by LordHenryWotton May 25, 2010
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