As used on channel, LDS stands for leaky dick syndrome, or the STD known as non-gonococcal urethritis, or NGU. Sometime ca 1996-97, there was an outbreak of LDS in the channel and by comparing notes, it could be traced Patient-Zero-like back to one particularly portentious coupling of channellers.

LDS is also a common abbreviation for Latter-Day Saints -- aka the Mormon Church. One channel wag remarked that whichever LDS it was, you wouldn't exactly want either of them knocking on your front door.