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1.
An adjective meaning something is so great it can only be compared to the amazingness of Ash Ketchum from the original Pokemon series.
Wow, that holographic Charizard limited edition pokemon card is so ash-tastic... I have to get it!
by shawy jill March 07, 2008
 
2.
something that is over the top amazing.
i went and saw the new twilight it was so ashtastic
by mini-me-94 November 20, 2010
 
3.
Ash-tastic: It means you can only hope to be so fantastic that one day that you possibly could be compared to the one the only Crash-ley.
Yeah you wish you were ash-tastic
by PIE_KIMI January 17, 2010