an abbreviation which means:"spaced out deeply", can be referred to people who tend to space out a lot randomly during the day, and won't be able to respond to anything that you say to them
1. Means "Stacks on Deck".
2. When used in an aggressive tone, it means "Swammies on Deck" or "Straps on Deck" aka "We Got Pistols, so don't play". (See Swammie) (Also used as the title for the new Tony Yayo mixtape with this meaning)