When masturbating no longer yields any fluid. You have masturbated all that you can: you have reached your fapping capacity. Your fapacity.
by Hermetic2 January 19, 2013
The capacity at which one can fap. The quota; the limit of fapping. The point of male masturbation when one is about to nut.
by Precalcruinedmylife June 08, 2016