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Derived from the word castration. Refers to an imaginary device used by women to gain testicular control over a man in derogatory or degrading manner.
Mate 1: "Where were you last night? You missed an amazing party!"

Mate 2: "Sorry man. My girlfriend busted out the castratron. I ended up watching 'The Notebook" instead."
by k1llsw1tch July 10, 2010
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