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1.
A combination of the words "rad" and "spectacular".
Lesbian mud wrestling is radtacular.
by $$$ February 21, 2004
 
2.
A large amount of awesomeness.
Man, that shooting star was RADTACULAR!.
by Scott M Cook May 11, 2008
 
3.
An expression of rejoice used in moments of satisfaction, especially to regard something as amazing. Use of this term may make someone, as a side effect, look like a tool.
Theo tried telling Eliza that her hair was radtacular, but she told him to fuck off; he was shaking his hips like a douchebag.

"That's so spectacular, it's rad and hipster. That's... you guessed it! Radtacular!"
by Fyedka_Rules July 19, 2014
 
4.
Slang term.
Used to completment or express the coolness of a situation, object or person.
Dude, that 360 was radtacular.
by Andrew Christie January 23, 2007
 
5.
adjective:describing something as spectacularly radical
Yo man, Blood Quest's show was radtacular.
by Dr. Thrashenstein May 31, 2006
 
6.
An adjective, to describe an object or event that is both Radical, and indeed spectacular. Such things would include firework-powered skateboards and Puppies with jetpacks.
Hey,Joe,did you see that race crash on TV yesterday?" "Sure did, Bob, it was totally radtacular!
by Jace Lightning January 08, 2011