the act of lotioning ones own cast (most often ones forearm cast) on the inside then inserting ones penis into the cast in a humping motion until climax is achived
the doctor will sure be upset when he finds out i'm a habital casturbater
by b-f@ January 16, 2010
verb. the act of pleasuring oneself with a broken arm.
I had to casturbate today,I couldn't take it anylonger.
by Jdisco October 09, 2012