A state of being, meaning to be relaxed and loose. Also, commonly used as a parting statement, similar to "Take it easy". It should be noted that although speculation has been made into what the "s's" are, their identity remains nonspecific. What is known is that they are NOT shaves, shits, and showers (the three s's).
Bill: "Hey bro, what are you up to?"
Andrew: "Oh, not much, just sticking to the s's."
Ralph: "I'll see you tomorrow, bud."
Pete: "Yeah, keep on sticking to the s's."