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1.
appearing incredibly great and having unforeseen or unexpected qualities; as in a shart is a fart with the added surprise of liquid feces.
That party was shartastic because I found 50 bucks.
by prototypical December 22, 2006
 
2.
The feeling of ecstasy after one releases a shart.
After 6 bean burritos for breakfast, 10 minutes, and one giant release, the feeling could only be described as shartastic.
by Joshsanity February 28, 2012