Anything that helps a person perform self-gratification (i.e. masturbate). These materials range from magazines to movies, but not limited to inanimate objects (i.e. the use of one's own imagination).
by Elmer January 05, 2006
Your mother's picture.
Hey Mike, could you please hand me my masturbatory aid...I'm gonna go beat off.
by danielle April 09, 2007