Something so FANTASTICALLY stupid or retarded, it ceases to be fantastic and thus becomes tardtastic! Lengthen the 'A' in tard for a more dramatic effect.
A word used to describe the previously indescribable epicness of an event, person, place, or thing. It is optimally utilized when mediocre terms such as "Awesome" or "Amazing" fail to fully encompass how truly wonderful an event, person, place orething was/is. The root "Thile" is German. "Thile" itself is defined as being incredible beyond comparison.
That solo was so thiltastic! I think my face just melted off.