A person in the Catholic Church who works to destroy the Mass by introducing innovations such as hand-holding and bad translations.
"Lit" comes from liturgy. "-nik" comes from russian. As in "sputnik." It's also been used in words like beatnik, refusenik and no-good-nik. In any case, it is a derogatory term used by Traditional Catholics towards the liberals who have ruined the Church over the past 40 years with their stupid changes to the Mass.
These stupid litniks not only have us holding hands during the Our Father, but now we have to prancing around like a bunch of Kansas City faggots.