The act of masturbation while excreting feces so that as the semen is emitted from the penis in an orgasm a poo is shot out of the anus at the same time, creating intense euphoria.
Ohh man I had the best poo masty 10 mins ago, there is semen on the floor
von RORYKNIGHT 21. August 2008
1 more definition
1, To finger ones ass while masturbating 2, To defecate in ones hand, and then use that hand to masturbate
Damn, i heard that Michael loves to get into the poo masties after listening to Elton John
von jigsaw666 8. April 2008