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When something is really mean and sassy, but its really funny.
Kelly: Your moms so fat she's fat.
Kenz: That was sasstastic!!!!
by K-Dog & T-Monz July 19, 2008
Fantastically sassy
like OMG, that chick has so much energy, she's sasstastic!
by sk8pss aka cap-10 crunch December 10, 2010