The term "unds" is short for "un-DS", which means "unworn and not in original condition". In the sneaker community, the term "DS" is often used to describe a pair of sneakers that are "deadstock", meaning they have never been worn and are still in their original condition. Once a pair of sneakers has been worn, even if only once, they are no longer considered "DS" and are instead referred to as "unds".