Top Definition
A fan-created word meaning something awesome or fantasic related to singer/songwriter Jason Mraz.
A combination of the words "Mraz" and "fantastic" Most commonly used by people who are awesome!
Person 1: Hey dude, check out my new "Jason Mmmmmraz" t-shirt!

Person 2: Gnarly! That's so Mraztastic! I wish I had one!

Person 1: High five!
by Mraztastic! July 07, 2009

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