What is Casterbate?
1.
the act of masterbating while having a plaster cast over the wrist in use.
James: "hey Pat, did you hear Alex broke his wrist?"
Pat: "yea, too bad he isn't ambidextrous, I bet his cock is burning from having to casterbate all week"
James: "I heard he deliberately broke his wrist because he enjoys the chafing"
Pat: "man, what a sick fuck"
See