The M.A.C System

Made popular by the FXX show It's Always Sunny in Philadelphia, where it is the fictional character Mac's version of the D.E.N.N.I.S System, in which he would make a move after women who the equally fictional character Dennis Reynolds used the D.E.N.N.I.S system on.

M - Move
A - After
C - Completion

Example of the M.A.C system

Man #1: Uses the D.E.N.N.I.S System on a woman and then ditches them.

Friend of Man #1: Takes his place as he puts the M.A.C system into effect.