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Adjective.
Definition 1: A complimentary statement of one's posterior.
Synonym: Bootylicious

Definition 2: A durogatory comment regarding someone who excels at being a fantastic asshole.
Synonym: Colossus Assholus
Example 1: "Gee, these pants make my rear end look asstastic!!"

Example 2: "My ex was asstastic, he left me destitute."
by Maven April 15, 2004
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1. Extremely bad; abominable
2. Extremely evil or cruel
1. The party-goers were completely out of control and left behind an asstastic mess.

2. "That asstastic whore just dumped me for my brother!"
by Trendon August 23, 2005
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1. When talking about a person, it's a good term, meaning they are attractive in the ass department.

2. When used in a situation, this means you are not satisfied with the outcome.
1. Damn, Jennifer Aniston is asstastic!
2. I'm going to the dentist today, this shit's asstastic.
by i look like hell August 17, 2009
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Asstastic is a combination of "Ass" and "Fantastic." Was created as a satire of all words that ironically mean "excellent," such as cool, wicked, tight, gnarly and sick.
"I just saw Sin City! It was Asstastic!"
by Heather M. May 06, 2005
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