An LTE is a Longest Text Ever. It is a very large text writting and shared on the internet that is written by a human without pasting anything and with coherent text (not solely random characters and words).
It is a sort of small trend that started in 2004 by a person who goes by Flaming Chicken (who since stopped) and has been continued by a small group of people with their own LTEs.
LTETT - Lycée Technique d'Ettelbruck.
It's a freakin' lame high school in Ettelbruck (Luxembourg) where idiots spends a few years of their life hanging around in self-called "school" without learning a single thing.
John: Hi, where do you go to School, man ?
Gaul: Yo dude, i go to the LTETT in Ettel-Br0oklyn!!
John: Oh, mani'm sorry...