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1.
Usually a college student, or person otherwise aged so that promiscuous behavior is tolerated, that hooks up, has sex, or plays chess with so many other likewise-aged people that a chart is needed to keep track of all the partners.
1: So I hooked up with Brian last night, and John on Friday.

2: Ooooh, you're such a chartkeeper.
by helpimtrappedinatauntaun January 30, 2011