Merry Christmas Charlie Manson! - S2-E16
Continuity mistake: When Cartman tells Elvin that he finished his fudgesicle, the two are standing right next to each other. The shot then cuts to focus on Elvin crying, where Cartman cannot be seen next to him. A couple seconds later, when Cartman hits Elvin over the head, the two are right next to each other, but in the shot of Elvin, Cartman cannot be seen next to him.
Chosen answer: It is based on the song 'Ave Santani', the song used in the movie "The Omen" (the lyrics of which are in Latin) The lyrics to their chant are "Hetus. Alte omnibus. Virtu e poquebus. Rectus. Hoc honebus." Which is Latin, Spanish and gibberish. "Omnibus" is Spanish for "bus", while "poquebus" and "honebus" are both Latin-sounding nonsense words. It loosely translates to "Glad. Other bus. [Poquebus] of courage. Correct. This [honebus]".
I entered "Hetus. Alte omnibus. Virtu e poquebus. Rectus. Hoc honebus" into Google translate and it came back as "heathen High to all. Power from few. Right. This honor".