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Having the qualities of the soda brand Shasta, esp. being easy to obtain (or cheap), but not of the greatest quality. mediocre
I was full after eating a shastastic lunch of four McDoubles at McDonalds

He doesn't have a complicated job or long hours, but he doesn't make too much money, either. He lives a shastastic life.

That girl Fred hooked up with at the party is ready for a good time, but isn't the type for a long-term relationship; she's pretty shastastic.
by Sam Schu January 01, 2009
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