by hallelujiah March 22, 2010

by Anonymous L-Value October 11, 2002

A modified form of "fantastic" that injects the word "ass" to reverse the meaning. Asstastic refers to something that sucks or is of poor quality.
by HugeBreasticle March 18, 2005

A word used to describe a girl with such a breathtaking, beautiful booty that it becomes that girls defining factor.
by Dr fantastic September 11, 2014

Damn that '63 Fender Strat is asstastic!
by andrew January 12, 2003

by Gilbert Godfrey December 8, 2004

by onedudeman July 16, 2006
