An Ash Wednesday-Palms Sunday (A.P.) catholic is really not a practicing catholic, but rather somebody who claims that they are. In reality, they only go to church on Ash Wednesday and Palms Sunday because they get something in return.
Who are those people in front of us? I've never seen them before" "They're A.P. Catholics." "Ohhhhhhhhhhhhhhhhhhhhhh! That explains it.