A theoretical act of self pleasure, often described as
masturbation squared, or F=M^2. Can also describe intense
masturbation, or simple everyday
masturbation for hyperbolic effect. The word is simply a contraction of the slang term 'fap' and the word 'masturbation'.
"My
parents just
caught me fapsturbating to skinemax, no tv for a week."
"Man, that's
harsh. They always say fapsturbation is a sin, but we know everyone does it."