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A Cas-sexual is a person that is extremely attached to the show Supernatural.

Said person also likely ships Destiel and Sabriel to the point of extreme fangirling.
Person 1: I'm a Cas-sexual
Person 2: I feel you man.

Person 3: Dafuq is this.

Person 1&2: Well there's this show Supernatural.....
by CANNIBILES_INSOMNIA July 16, 2016
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