Penitenziagite

Penitenziagite is a rallying cry derived from the Latin "poenitentiam agite," meaning the same. It has been also interpreted as a paraphrase of the Greek "πένητες διάγετε" attributed to Christ, meaning "live life as a pauper."
The phrase was used by the Dulcinian movement founded by Gerard Segarelli in the 13th century, a movement named after the disciple Fra Dolcino.
The phrase is used in the novel The Name of the Rose by Umberto Eco and in the Jean-Jacques Annaud [The Name of the Rose (film)|movie] and also The [Name of the Rose (miniseries)|a miniseries] of same name. It is also used by Guillermo del Toro as Pappy McPoyle in season 8, episode 3 of It's [Always Sunny in Philadelphia], "The Maureen Ponderosa Wedding Massacre".
A sample of Ron Perlman's character from the 1986 movie The Name of [the Rose (film)|The Name of the Rose] saying the word appears in the song "Endemoniada," the first track on the album The Nephilim, by the band Fields of the Nephilim.