fantasicating 

to be simultaneously fantastic and fascinating

The geysers, mud pots, mineral pools, etc. at Yellowstone are truly fantasicating!

fantasicating by Brubaker August 8, 2003

Fantastinating 

A piece of news that is so amazingly interesting that it is considered "fantastic" and "fascinating" at the same time.

Little brother: "My Pokemon is almost level 100!"

Big brother: "That's fantastinating."

Fantastinating by s13teddy August 28, 2009

Fantasinating

Something that is both fantastic and fascinating

"WOW! That's so fantastic and fascinating!"
"No, that's fantasinating!"

Fantasinating by bookkitty September 4, 2019