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Possibly a horrible horrible perversion of the word jism/gissom and/or gasm/orgasm.
In use, a female orgasmic expulsion from the vagina. The female equivalent of semen.
<Robosmaher> Oh your chasom came out of your pussy.

<Robosmaher> Chasom. Woah! It sprayed me.
by NewEvolution July 26, 2006
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