adj. (nar tast ick)
1. The words gnarly and fantastic combined, explaining something that is worthy of being called both gnarly and fantastic, but better than both; 2. Extremely Awesome; 3. Rad/Radical/Radtastic; 4. Insane; 5. super duper etc...
antonyms: dumb, lame, stupid, weak
1. Dude that was the most gnar-tastic trick I have ever seen.
2. Tony Hawk and Rodney Mullen are some pretty gnar-tastic skaters.