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.
"It's a TARDTASTIC day today!"
"This photocopier is acting completely tardtastic today!"
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 ore thing was/is. The root "Thile" is German. "Thile" itself is defined as being incredible beyond comparison.