Someone who claims to have more testosterone than you. Shows this by purchasing expensive and outrageous pieces of bling. Has to constantly prove he is more macho than you. "Little dick syndrome".
It is an abbreviation for "Lore Discussion Squad," which is a group of people who constantly discuss the lore of the well known smp the "Dream SMP." The LDS have grown to the amount to where they are a cult now and should be feared by all.