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A Castitute is an IB student pimped by their CAS Manager to do anything which will get them CAS hours.
IB Student 1: "Hey I just signed up for the bake sale for CAS hours. I'll get 3 hours for this"

IB Student 2: "Man, you're such a Castitute"
by dontpetthesheep October 23, 2008
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