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Stands for DEFinitely SATanic, inspired by some video on Youtube. Describes the usage of satanic, pagan or otherwise occult symbolism and imagery in advertising, movie posters, music videos, t-shirts, product labels, the back of the 1$ bill, US government buildings, corporate logos, heraldry, portraiture, etc.
guy1: Have you seen the new Lady Gaga video?
guy2: Yah, DEFSAT!

guy1: Have you been to the LA Public Library?
guy2: Yah, DEFSAT!

guy1: Do you think the Black Swan movie is DEFSAT?
guy2: DUH...
by telv April 13, 2011