Acronym for Least Drunk Driver. Usually delegated after a Designated Driver has been established and that driver gets smashed more than anyone there.

LDD, or Lego Digital Designer is a CAD-like program for use on both macs and PCs. You can create your own lego models on it and upload them to the Lego website, where you and other people can buy them. The most recent patch was this April, contains several new parts, though there are tons still missing. In addition, the parts in LDD may have a different price on the website.

Long dick daddy

LDD (Long Donkey Dong) is a term used by the vampire traders in the Dr. Bob School of Forex Trading. It is a type of pattern seen in forex and stock trading charts. It is easily identified by a string of short candles staying inside the bollinger bands on a candlestick chart. It is an indication of a lack of direction and consolidation in a forex pair or stock, and is a very risky time to trade, since a channel breakout tends to lack much momentum in either direction and could turn back around and return to the channel quickly. The name of this pattern is derived from the similarity in appearance of this type of channel to the extended male member of a donkey.

Last Doable Day. The last day a woman is considered attractive enough to gain spontaneous sexual interest from men.

Large double double cup of coffee (mostly Canadian)

LDD stands for Long Distance Dedication...as used by Casey Kasem, Ryan Seacrest, or, most recently, on "Radio with a Twist," the nation's first syndicated gay-friendly radio show.