Comparative to the term Half-ass, although this is only used in church settings. A half Masser
will leave Mass early because they feel that their
time is too important to waste on staying the entire mass. The most common
time to spot a Half-Masser is right before or during the final hymn of the mass, because they want to miss out on the massive cluster fuck that occurs in the parking lot immediate following Mass.
Half Massers are only above people who attend Mass once a year in terms of how much they are hated in the religious
society.
...And
God shed his ligggghhhht onnnn ussssss!!! ... Oh...
Christ, there goes those Johnsons, I
swear they are Half-Massing It every Sunday!