SFTS

Short for the phrase "straight from the source." The acronym can be used in reference to people, places, or things.

Its use removes all ambiguity surrounding where a piece of information or something came from, emphasizing that it is not second-hand information; instead, it is straight from the source.

Person 1: Yo where did you hear that they were not returning to the team for the new season??

Person 2: SFTS bro.

SFTS

Short for "Shouting from the sidelines". It's used when you think you have something relevant to contribute to an ongoing conversation that you observe, even though you weren't part of the conversation when it started and might not want to commit to it beyond your one comment.

Person A: Have you seen the new movie? It was great!
Person B: Yeah, I really liked it. I'm gonna buy it on DVD!
Person A: Yeah, I'd love to see it again too!
(Person C, overhearing the conversation): SFTS, but I heard it's coming to Netflix in 4k soon, so no need to buy it on DVD.