SAS is the acronym for Self Aware Substructure. Coined by cosmologist Max Tegmark, it refers to the idea that self aware entities must necessarily exist as sub-systems within a larger systematic structure. Presumably, there are other possible complex, systematic structures than our own universe, that are capable of producing types of self aware substructures aka intelligent beings.
"Given a mathematical structure, we will say that it has
physical existence if any self-aware substructure (SAS)
within it subjectively perceives
itself as living in a physically real world." - Max Tegmark, arXiv:0905.1283
physical existence if any self-aware substructure (SAS)
within it subjectively perceives
itself as living in a physically real world." - Max Tegmark, arXiv:0905.1283
by semeiotike January 14, 2017
Get the SASmug. Special Air Service. The special forces of Britain. Basicly the best trained force on earth. Their numbers may not be as great as other special forces, but hey! I guess they're the best example of quality over quantity. Not sure what more to say. They fuck up terrorists and blow shit up.
by Karl angryUtookmyname February 24, 2021
Get the SASmug. Veta, "snaží sa byť seksy" sa väčšinou spája s osobou, ktorá by najradšej kurvila 24/7 a prejebala celé sídlisko
by K9_Kr October 3, 2020
Get the sa snaží byť seksymug. Probably one of the longest names in the world. This name means “the most wonderful thing in the world.” He was the first of the two brothers, the other being Chang.
by bluestinger66 January 7, 2024
Get the Tikki Tikki Tembo-no Sa Rembo-chari Bari Ruchi-pip Peri Pembomug. by Wintrate Blizzard February 4, 2024
Get the sa;dtgjmug. 
Use this term if someone is saying something negative about a post that you can easily scroll away from
(Meaning: "scroll away, ninja")
(Meaning: "scroll away, ninja")
by A_tiktok_user_1672 July 12, 2025
Get the sa,nmug.