When you're describing something or someone as being a loaf (lazy, won't do anything, boring) and they do something extremely stupid or something extraordinaire.
Sofia: Guys, I just figured out how to properly cut bread.

Jordan: Wow
Grace: That's loaftastic!

Sofia: Everybody listen up...I've discovered the formula for finding the circumference of a circle.
Jordan: Loaftastic!
by Guillermo Barros Schletto August 05, 2010

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