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."