An acronym that holds great significance when dealing with a religious retreat for young adults in high school called "Kairos". The acronym's meaning is learned sometime over the course of the retreat. Only people who have gone on a Kairos retreat know what it means and are not allowed to tell anyone who hasn't gone what it means (I have gone). The only way to know what LTF stands for is to go on the retreat yourself.
"What does LTF mean?" "Have you gone?" "No" "You have to find out for yourself on Kairos then."