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1.
Self Appropriated Sexy Time, or masturbation. Originated on the fan forum Murmurs.com.
After engaging in SAST, Derek would konk out for hours.
by ermbark June 08, 2006
 
2.
(adj). Super, Awesome, Soft, and Touchable. Usually followed by the word "hair".
Bob: You have SAST hair.
Jane: Why thank you.
by Noah K. January 06, 2006