A combination of the words 'Awesome' and 'Fantastic' in order to describe something that its beyond either of the words on their own. An '-al' can be added to the end for an added effect.
Fred: Did you see Chuck Norris roundhouse 9 guys at once last night?
Tom: Yeah dude. It was awesometastic.
A nice, playful way of calling someone less than intelligent. Most often used in situations where an individual has done something dumb and hurt himself.
Carl: Ouch! I just shut my hand in the door!
Steve: Hahahaha. Dummy head.
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