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1.
A word made famous by rapper, Kid Cudi on his Twitter page. A word to define a party or event where peope are most likely to party extremly hard, drink excessively, roll on pills and smoke tons of weed. Ragetastic parties are usually not going to be remembered the next day,due to heavy drug use.
Symone's party last night was ragetastic. Everyone was shit-faced after they faced the 4th blunt!
by SuperDuperBoo July 30, 2009
 
2.
A event, person, or thing that is so anger or makes people angry, it's fantastic.
I had finally caught 139 Pokemon, and then someone erased my game. It was ragetastic
by LLMARSUPIAL April 16, 2011