LDS is not the same thing as the drug LSD, although it is thought to have similar psychotropic effects on painters.
This is actually a tricky name that Mormon missionaries use to hide the name of their church so that you'll let them into your house where they try to hypnotize you with psychedelic pictures of "Latter Day Saints" and ouija-board stories about your ancestors.
- See: Mormon
The initials stand for Latter Day Saints, which is the second part of the official name of the Mormon Church. However, when missionaries are trying to get into a house they'll usually empasize the first part of the name: "We're from the Church of Jesus Christ of Latter Day Saints..."
It sometimes works. Poor, poor old people...