A shorthand abbreviation for the phrase "JUST SAYIN". It was originated by teenage girls for use in instant messages and text messaging, but has since been adopted by a very small segment of grown men that are still trying to hold on to their youthful qualities and adolescent absurdity. The use of this phrase has also been used to locate those with casting potential on news specials hosted by Chris Hansen.
When carrying on a conversation with a grown man, he actually responded to something that I said with the following "JS man JS". WTF does that mean?