a hypocrite who claims to be a good, diligent Christian and goes to church and sometimes even gets involved every Sunday, but doesn't give a damn and is the polar opposite during the rest of the week, only to return the following Sunday so they can just put this "mask" back on again.
Jessica: I went to a Marilyn Manson concert and got wasted last night. It was AWESOME!
Trent: *obvious sarcasm* Whatever. You coming to church this Sunday?
Jessica: Fuck yeah, time to take off the horns and put on my halo. ;)
Trent: Haha, Jess, you are such a Sunday Jack. Catch you on Sunday. *hangs up phone* Oh no...Marilyn Manson ate my girlfriend. :/