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A portmanteau of Radical and Badass. Used when something is so monumentally awesome that you have to think of a new word to describe it.
Whoa! Her vagoo is fucking sweet! It's...it's...it's RADASS!
Radass by Someone named Archer April 18, 2008

Radiasian 

a Jap
man, first hiroshima then nagasaki and now this shit, japan gotta be chock full of radiasians

SCORE
japan 0 : radiation 3
Radiasian by Young Reezie May 5, 2011
-adjective;

1. having qualities that gives great motivation to live above the ordinary

2. excellence of its own kind

3. opens up the mind to see, hear, think about

-noun

the ideal of beauty in the membrane
"a radass like you kid, is like an olsen twin, you build a giant fan base of jealous followers drinking soy milk in a cape"

a radass doesn't accept an ordinary life; doesn't follow trends; doesn't take no for an answer

"ma'am you were going 80 mph in a 55... i need to see your license and registration" - officer
"oh my.. yes.. i'm sorry... here it is *smiles cutely*"radass
"i'm just going to give you a verbal warning.. get home before your daddy kicks your butt" officer
Radass by diamond pistol lb March 31, 2009

radassical 

better than rad. more powerful than bad. and truly assylicious.
dood. that trick was radassical!
radassical by jack bender July 14, 2006

Radisson Inn

The place where smoke bombs are thrown in to ruin dances.
Someone threw a smoke bomb during our 8th grade promotion dance at the Radisson Inn.
Radisson Inn by SixPackjonny1 June 14, 2010
1: Combination of Rad and Ass to make the ultimate word

2: To define something so awesome beyond comprehension

3: To Define an ass
1: Yes scott, I just made up the word raddaass just now

2: Java Monsters are so raddass, my mind would explode if i tried to fathom their raddassness

3: Christian Mu's ass is infact, raddass
raddass by Christian Mu March 7, 2008