Matribrony
When two straight males have a deep, intimate and lifelong connection with one another. Often preceded by a period of bromantic courtship, this commitment is not easily broken under broman catholic dogma.
Addison and Keith were disheartened to think that their bromance was doomed to end when the apartment lease was up. Thus they decided to enter into the bonds of holy matribrony, so Addison could keep playing Keith's Xbox 360 for the rest of their natural lives.